TY  - CONF
AU  - Jovanović, Darko
AU  - Cuvaca, Ivan
AU  - Scott, Jon
AU  - Knežević, Stevan
PY  - 2021
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/838
AB  - Ogled je sproveden 2019. godine u Haskell Agriculture Laboratory, Konkord,
Nebraska, SAD. Za ogled je korišćena soja tolerantna na aktivne supstance (a.s.)
dikamba i glifosat. Cilj ogleda bio je da se utvrdi uticaj PRE-EM herbicida na kritično
vreme suzbijanja korova u usevu soje tolerantne na dikambu. Ogled je dizajniran po
principu potpuno slučajnog blok sistema sa 28 tretmana, 4 herbicidna režima kao
glavnim obeležijma posmatranja i 7 različitih vremena uklanjanja korova u 4
ponavljanja. Od herbicidnih režima su korišćeni: režim bez PRE-EM herbicida sa
glifosatom kao POST-EM, režim sa acetohlorom i dikambom kao PRE-EM i
glifosatom kao POST-EM, acetohlor i dikamba kao PRE-EM i glifosat i dikamba kao
POST-EM, i acetohlor i fomesafen kao PRE-EM i acetohlor, glifosat i dikamba kao
POST-EM kombinacija. Korovi su uklanjani u pet vremenskih perioda, tj. u pet
fenofaza soje: prva troliska (BBCH 11), treća troliska (BBCH 13), šesta troliska
(BBCH 16), puno cvetanje (BBCH 65) i početak formiranja zrna u mahuni (BBCH 70),
kao i nezakorovljena i zakorovljena parcela. U parcelama gde su primenjivani PREEM
herbicidi, kritičan momenat suzbijanja korova je bio drastično pomeren prema
kasnijim fenofazama razvoja useva u odnosu na parcele gde PRE-EM herbicidi nisu
primenjivani. Primenom navedenih herbicidnih režima, kritično vreme suzbijanja
korova bilo je pomereno za 632 Suma Efektivnih Temperatura (SET) do BBCH 14
faze razvoja soje, odnosno 28 dana nakon nicanja gde su primenjivani acetohlor i
dikamba kao PRE-EM a glifosat kao POST-EM, 861 SET do BBCH 16 faze razvoja
soje, odnosno 32 dana nakon nicanja za acetohlor i dikambu kao PRE-EM i glifosat i
dikambu kao POST-EM i 1060 SET do BBCH 60 faze razvoja soje, odnosno 42 dana
nakon nicanja za acetohlor i fomesafen kao PRE-EM i acetohlor, glifosat i dikambu
kao POST-EM. Uticaj PRE-EM herbicida na pomeranje kritičnog vremena suzbijanja
korova je evidentan i zbog toga treba nastojati na njihovom uključivanju u koncept
integralne zaštite, kao i u borbi protiv rezistentnih korovskih vrsta.
PB  - Beograd : Herbološko društvo Srbije
C3  - XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta : 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators
T1  - Uticaj PRE-EM herbicida na kritično vreme suzbijanja korova u soji
SP  - 49
UR  - https://hdl.handle.net/21.15107/rcub_rivec_838
ER  - 

@conference{
author = "Jovanović, Darko and Cuvaca, Ivan and Scott, Jon and Knežević, Stevan",
year = "2021",
abstract = "Ogled je sproveden 2019. godine u Haskell Agriculture Laboratory, Konkord,
Nebraska, SAD. Za ogled je korišćena soja tolerantna na aktivne supstance (a.s.)
dikamba i glifosat. Cilj ogleda bio je da se utvrdi uticaj PRE-EM herbicida na kritično
vreme suzbijanja korova u usevu soje tolerantne na dikambu. Ogled je dizajniran po
principu potpuno slučajnog blok sistema sa 28 tretmana, 4 herbicidna režima kao
glavnim obeležijma posmatranja i 7 različitih vremena uklanjanja korova u 4
ponavljanja. Od herbicidnih režima su korišćeni: režim bez PRE-EM herbicida sa
glifosatom kao POST-EM, režim sa acetohlorom i dikambom kao PRE-EM i
glifosatom kao POST-EM, acetohlor i dikamba kao PRE-EM i glifosat i dikamba kao
POST-EM, i acetohlor i fomesafen kao PRE-EM i acetohlor, glifosat i dikamba kao
POST-EM kombinacija. Korovi su uklanjani u pet vremenskih perioda, tj. u pet
fenofaza soje: prva troliska (BBCH 11), treća troliska (BBCH 13), šesta troliska
(BBCH 16), puno cvetanje (BBCH 65) i početak formiranja zrna u mahuni (BBCH 70),
kao i nezakorovljena i zakorovljena parcela. U parcelama gde su primenjivani PREEM
herbicidi, kritičan momenat suzbijanja korova je bio drastično pomeren prema
kasnijim fenofazama razvoja useva u odnosu na parcele gde PRE-EM herbicidi nisu
primenjivani. Primenom navedenih herbicidnih režima, kritično vreme suzbijanja
korova bilo je pomereno za 632 Suma Efektivnih Temperatura (SET) do BBCH 14
faze razvoja soje, odnosno 28 dana nakon nicanja gde su primenjivani acetohlor i
dikamba kao PRE-EM a glifosat kao POST-EM, 861 SET do BBCH 16 faze razvoja
soje, odnosno 32 dana nakon nicanja za acetohlor i dikambu kao PRE-EM i glifosat i
dikambu kao POST-EM i 1060 SET do BBCH 60 faze razvoja soje, odnosno 42 dana
nakon nicanja za acetohlor i fomesafen kao PRE-EM i acetohlor, glifosat i dikambu
kao POST-EM. Uticaj PRE-EM herbicida na pomeranje kritičnog vremena suzbijanja
korova je evidentan i zbog toga treba nastojati na njihovom uključivanju u koncept
integralne zaštite, kao i u borbi protiv rezistentnih korovskih vrsta.",
publisher = "Beograd : Herbološko društvo Srbije",
journal = "XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta : 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators",
title = "Uticaj PRE-EM herbicida na kritično vreme suzbijanja korova u soji",
pages = "49",
url = "https://hdl.handle.net/21.15107/rcub_rivec_838"
}

Jovanović, D., Cuvaca, I., Scott, J.,& Knežević, S.. (2021). Uticaj PRE-EM herbicida na kritično vreme suzbijanja korova u soji. in XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta : 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators
Beograd : Herbološko društvo Srbije., 49.
https://hdl.handle.net/21.15107/rcub_rivec_838

Jovanović D, Cuvaca I, Scott J, Knežević S. Uticaj PRE-EM herbicida na kritično vreme suzbijanja korova u soji. in XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta : 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators. 2021;:49.
https://hdl.handle.net/21.15107/rcub_rivec_838 .

Jovanović, Darko, Cuvaca, Ivan, Scott, Jon, Knežević, Stevan, "Uticaj PRE-EM herbicida na kritično vreme suzbijanja korova u soji" in XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta : 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators (2021):49,
https://hdl.handle.net/21.15107/rcub_rivec_838 .

TY  - CONF
AU  - Cuvaca, Ivan
AU  - Jovanović, Darko
AU  - Scott, Jon
PY  - 2020
UR  - https://cropwatch.unl.edu/2020/impact-24-d-micro-rates-non-24-d-tolerant-soybean
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/841
AB  - Auxin type herbicides (eg. dicamba, 2,4-D) are an integral component of major cropping systems in North America. With the recent launching of Enlist E3 soybean in the U.S., in-season application of 2,4-D to soybean fields is expected to increase. This will enable use of Enlist One and Enlist Duo herbicides thus broadening farmers’ flexibility in controlling tough-to-control broadleaf and grass weeds including glyphosate-resistant biotypes. Despite the availability of new Enlist herbicides with low volatility potential, their potential off-target movement represents a major threat to non 2,4-D tolerant soybean as well as other broadleaf crops. Furthermore, the negative impact of 2,4-D drift on non-2,4-D tolerant crops may vary with the rate of the herbicide, crop type and/or growth stage at time of drift occurrence. Given its total acreage, this negative impact is likely to be more pronounced in the U.S. soybean belt. Of the approximately 240 million acres planted to the four major crops (i.e. corn, soybean, wheat and cotton) in the U.S. in 2018, corn and soybean accounted for 75% of the planted acreage and 90 million acres each (USDA Ag Outlook Forum for 2018 U.S. crop acreage, yield, production, and price projections for major U.S. crops). Although Enlist E3 soybean was available for planting in 2019 season, it will not be available in commercial quantities until the 2020 season. Since the majority of soybeans are still non-2,4-D tolerant soybean, it is important to understand the potential impact of 2,4-D drift. Therefore, field study was initiated in 2019 (and will be repeated in 2020) to measure the impact of 2,4-D micro-rates on four soybean types (Dicamba-Tolerant, Roundup Ready, Liberty-Link and Conventional soybean).
PB  - University of Nebraska–Lincoln : Institute of Agriculture and Natural Resources
C3  - Cropwatch : 2020 crop production clinic and nebraska crop management conference proceedings
T1  - Impact of 2,4-D Micro-Rates on non-2,4-D Tolerant Soybean
EP  - 29
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_rivec_841
ER  - 

@conference{
author = "Cuvaca, Ivan and Jovanović, Darko and Scott, Jon",
year = "2020",
abstract = "Auxin type herbicides (eg. dicamba, 2,4-D) are an integral component of major cropping systems in North America. With the recent launching of Enlist E3 soybean in the U.S., in-season application of 2,4-D to soybean fields is expected to increase. This will enable use of Enlist One and Enlist Duo herbicides thus broadening farmers’ flexibility in controlling tough-to-control broadleaf and grass weeds including glyphosate-resistant biotypes. Despite the availability of new Enlist herbicides with low volatility potential, their potential off-target movement represents a major threat to non 2,4-D tolerant soybean as well as other broadleaf crops. Furthermore, the negative impact of 2,4-D drift on non-2,4-D tolerant crops may vary with the rate of the herbicide, crop type and/or growth stage at time of drift occurrence. Given its total acreage, this negative impact is likely to be more pronounced in the U.S. soybean belt. Of the approximately 240 million acres planted to the four major crops (i.e. corn, soybean, wheat and cotton) in the U.S. in 2018, corn and soybean accounted for 75% of the planted acreage and 90 million acres each (USDA Ag Outlook Forum for 2018 U.S. crop acreage, yield, production, and price projections for major U.S. crops). Although Enlist E3 soybean was available for planting in 2019 season, it will not be available in commercial quantities until the 2020 season. Since the majority of soybeans are still non-2,4-D tolerant soybean, it is important to understand the potential impact of 2,4-D drift. Therefore, field study was initiated in 2019 (and will be repeated in 2020) to measure the impact of 2,4-D micro-rates on four soybean types (Dicamba-Tolerant, Roundup Ready, Liberty-Link and Conventional soybean).",
publisher = "University of Nebraska–Lincoln : Institute of Agriculture and Natural Resources",
journal = "Cropwatch : 2020 crop production clinic and nebraska crop management conference proceedings",
title = "Impact of 2,4-D Micro-Rates on non-2,4-D Tolerant Soybean",
pages = "29-1",
url = "https://hdl.handle.net/21.15107/rcub_rivec_841"
}

Cuvaca, I., Jovanović, D.,& Scott, J.. (2020). Impact of 2,4-D Micro-Rates on non-2,4-D Tolerant Soybean. in Cropwatch : 2020 crop production clinic and nebraska crop management conference proceedings
University of Nebraska–Lincoln : Institute of Agriculture and Natural Resources., 1-29.
https://hdl.handle.net/21.15107/rcub_rivec_841

Cuvaca I, Jovanović D, Scott J. Impact of 2,4-D Micro-Rates on non-2,4-D Tolerant Soybean. in Cropwatch : 2020 crop production clinic and nebraska crop management conference proceedings. 2020;:1-29.
https://hdl.handle.net/21.15107/rcub_rivec_841 .

Cuvaca, Ivan, Jovanović, Darko, Scott, Jon, "Impact of 2,4-D Micro-Rates on non-2,4-D Tolerant Soybean" in Cropwatch : 2020 crop production clinic and nebraska crop management conference proceedings (2020):1-29,
https://hdl.handle.net/21.15107/rcub_rivec_841 .

TY  - CONF
AU  - Jovanović, Darko
AU  - Božić, Dragana
AU  - Vrbičanin, Sava
AU  - Brankov, Milan
PY  - 2020
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/839
AB  - Usled sve učestalije pojave rezistentnosti korova na herbicide kao i nedostatka novih
aktivnih supstanci herbicida na tržištu u poslednje tri decenije, trend savremene
zaštite bilja ide u pravcu optimizacije i usavršavanja primene postojećih herbicida
kako bi oni ispoljili maksimalnu efikasnost u suzbijanju korova, čime bi se odložila
pojava rezistentnosti. Ogled je postavljen 2021. godine na oglednom polju Instituta za
kukuruz “Zemun Polje”. Cilj ogleda je bio da se ispita uticaj rasprskivača, ađuvanata i
dva preparata herbicida nikosulfuron različitih proizvođača na njihovu efikasnost u
suzbijanju korova. Ogled je postavljen kao potpuno slučajan blok sistem sa 12
tretmana, parcelom bez korova (kontrola) i zakorovljenom parcelom. Ispitivani
herbicidi bili su: Motivell Extra 6 OD® (nikosulfuron 60g/l) i Talisman OD®
(nikosulfuron 40g/l) primenjeni bez dodatka ađuvanata kao i sa ađuvantima u varijaciji
sa dva tipa rasprskivača, u istoj količini od 45 g a.s./ha. Od ađuvanata primenjeni su:
amonijum sulfat - AMS (20%N + 24%S) i nejonski surfaktant Dash® (mešavina
metilestra masnih kiselina (metil-palmitat, metil-oleat, metil stearat, metil mistirat),
fosfatni estar etoksiliranih masnih alkohola, oleinska kiselina i mešavina
alkilbenzena). Rasprskivači korišćeni u ovom ogledu bili su: TeeJet XR11002
(Extended Range) koji proizvodi sitnije kapi bolje pokrovnosti, podložnije driftu i
TeeJet TTI11002 (Turbo TeeJet Induction) koji proizvodi krupnije kapi slabije
pokrovnosti, manje podložne driftu. Efikasnost herbicida ocenjivana je 21 dan nakon
primene herbicida, merenjem suve mase korova. Tretmani gde su primenjivani
herbicidi bez dodatka ađuvanata sa oba tipa rasprskivača imali su značajan uticaj na
redukciju suve mase korova. Ipak, najveće redukcije suve mase u odnosu na kontrolu
bile su u tretmanima gde je primenjivan Motivell Extra 6 OD® u kombinaciji sa
ađuvantom Dash® i iznosile su 92,3% u varijanti sa XR11002 rasprskivačem,
odnosno 93,5% u varijanti sa TTI11002 rasprskivačem. Najmanja redukcija u suvoj
masi uočena je kod tretmana koji su u sebi sadržali AMS i iznosila je 83,7% za
herbicid Motivell Extra 6 OD® u varijanti sa XR11002 rasprskivačem i 84,1% u
varijanti sa TTI11002 rasprskivačem, dok je za herbicid Talisman OD® iznosila 69,7%
u varijanti sa XR11002 rasprskivačem, odnosno 69,8% u varijanti sa TTI11002
rasprskivačem. Uticaj ađuvanata i preparata herbicida na redukciju suve mase bio je
najznačajniji i najuočljiviji, dok uticaj rasprskivača nije bio značajan.
PB  - Beograd : Herbološko društvo Srbije
C3  - XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators
T1  - Uticaj ađuvanata i rasprskivača na suzbijanje korova u kukuruzu nikosulfuronom
SP  - 91
UR  - https://hdl.handle.net/21.15107/rcub_rivec_839
ER  - 

@conference{
author = "Jovanović, Darko and Božić, Dragana and Vrbičanin, Sava and Brankov, Milan",
year = "2020",
abstract = "Usled sve učestalije pojave rezistentnosti korova na herbicide kao i nedostatka novih
aktivnih supstanci herbicida na tržištu u poslednje tri decenije, trend savremene
zaštite bilja ide u pravcu optimizacije i usavršavanja primene postojećih herbicida
kako bi oni ispoljili maksimalnu efikasnost u suzbijanju korova, čime bi se odložila
pojava rezistentnosti. Ogled je postavljen 2021. godine na oglednom polju Instituta za
kukuruz “Zemun Polje”. Cilj ogleda je bio da se ispita uticaj rasprskivača, ađuvanata i
dva preparata herbicida nikosulfuron različitih proizvođača na njihovu efikasnost u
suzbijanju korova. Ogled je postavljen kao potpuno slučajan blok sistem sa 12
tretmana, parcelom bez korova (kontrola) i zakorovljenom parcelom. Ispitivani
herbicidi bili su: Motivell Extra 6 OD® (nikosulfuron 60g/l) i Talisman OD®
(nikosulfuron 40g/l) primenjeni bez dodatka ađuvanata kao i sa ađuvantima u varijaciji
sa dva tipa rasprskivača, u istoj količini od 45 g a.s./ha. Od ađuvanata primenjeni su:
amonijum sulfat - AMS (20%N + 24%S) i nejonski surfaktant Dash® (mešavina
metilestra masnih kiselina (metil-palmitat, metil-oleat, metil stearat, metil mistirat),
fosfatni estar etoksiliranih masnih alkohola, oleinska kiselina i mešavina
alkilbenzena). Rasprskivači korišćeni u ovom ogledu bili su: TeeJet XR11002
(Extended Range) koji proizvodi sitnije kapi bolje pokrovnosti, podložnije driftu i
TeeJet TTI11002 (Turbo TeeJet Induction) koji proizvodi krupnije kapi slabije
pokrovnosti, manje podložne driftu. Efikasnost herbicida ocenjivana je 21 dan nakon
primene herbicida, merenjem suve mase korova. Tretmani gde su primenjivani
herbicidi bez dodatka ađuvanata sa oba tipa rasprskivača imali su značajan uticaj na
redukciju suve mase korova. Ipak, najveće redukcije suve mase u odnosu na kontrolu
bile su u tretmanima gde je primenjivan Motivell Extra 6 OD® u kombinaciji sa
ađuvantom Dash® i iznosile su 92,3% u varijanti sa XR11002 rasprskivačem,
odnosno 93,5% u varijanti sa TTI11002 rasprskivačem. Najmanja redukcija u suvoj
masi uočena je kod tretmana koji su u sebi sadržali AMS i iznosila je 83,7% za
herbicid Motivell Extra 6 OD® u varijanti sa XR11002 rasprskivačem i 84,1% u
varijanti sa TTI11002 rasprskivačem, dok je za herbicid Talisman OD® iznosila 69,7%
u varijanti sa XR11002 rasprskivačem, odnosno 69,8% u varijanti sa TTI11002
rasprskivačem. Uticaj ađuvanata i preparata herbicida na redukciju suve mase bio je
najznačajniji i najuočljiviji, dok uticaj rasprskivača nije bio značajan.",
publisher = "Beograd : Herbološko društvo Srbije",
journal = "XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators",
title = "Uticaj ađuvanata i rasprskivača na suzbijanje korova u kukuruzu nikosulfuronom",
pages = "91",
url = "https://hdl.handle.net/21.15107/rcub_rivec_839"
}

Jovanović, D., Božić, D., Vrbičanin, S.,& Brankov, M.. (2020). Uticaj ađuvanata i rasprskivača na suzbijanje korova u kukuruzu nikosulfuronom. in XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators
Beograd : Herbološko društvo Srbije., 91.
https://hdl.handle.net/21.15107/rcub_rivec_839

Jovanović D, Božić D, Vrbičanin S, Brankov M. Uticaj ađuvanata i rasprskivača na suzbijanje korova u kukuruzu nikosulfuronom. in XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators. 2020;:91.
https://hdl.handle.net/21.15107/rcub_rivec_839 .

Jovanović, Darko, Božić, Dragana, Vrbičanin, Sava, Brankov, Milan, "Uticaj ađuvanata i rasprskivača na suzbijanje korova u kukuruzu nikosulfuronom" in XI Kongres o korovima i savetovanje o herbicidima i regulatorima rasta 11th Weed Science Congress and Symposium on Herbicides and Growth Regulators (2020):91,
https://hdl.handle.net/21.15107/rcub_rivec_839 .

TY  - JOUR
AU  - Jovanović, Darko
AU  - Cuvaca, Ivan
AU  - Knežević, Stevan
PY  - 2020
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/837
AB  - Field experiment was conducted in 2019 at Haskell Agriculture Laboratory, Concord, NE, USA. Goal of the study was to test the influence of PRE-EM herbicides on the Critical Time for Weed Removal (CTWR) in dicamba-tolerant soybean. The study was arranged in a split-plot design which consisted of four herbicide regimes as main plot treatments and seven weed removal timings as subplot treatments, with four replications. The herbicide regimes included: (1) no PRE and glyphosate, (2) acetochlor and dicamba as PRE and glyphosate as POST, (3) acetochlor and dicamba as PRE and glyphosate and dicamba as POST, and (4) acetochlor and fomesafen as PRE and acetochlor, glyphosate and dicamba as POST. The five weed removal times included the V1, V3, V6, R2 and R5, and there were also weedy and weed-free season long plots. By utilizing herbicide regimes, the CTWR was delayed to 632 GDD (until V4 soybean growth stage, 28 days after emergence) for acetochlor and dicamba as PRE and glyphosate as POST, 861 GDD (until V6 soybean growth stage, 32 days after emergence) for acetochlor and dicamba as PRE and glyphosate and dicamba as POST, and 1060 GDD (until R1 soybean growth stage, 42 days after emergence) for acetochlor and fomesafen as PRE and acetochlor, glyphosate and dicamba as POST.
AB  - Ogled je sproveden 2019. godine u Haskell Agricalture Laboratory, Concord, NE, USA. Cilj
ogleda bio je da se utvrdi uticaj PRE-EM herbicida na kritičan momenat suzbijanja korova u usevu
soje tolerantne na dikambu. Ogled je postavljen kao potpuno slučajan blok sistem sa 28 tretmana
(4 herbicidna tretmana sa 7 različitih vremena uklanjanja korova) u 4 ponavljanja. Primenjeni
herbicidni tretmani su: (1) glifosat POST-EM, (2) acetohlor i dikamba PRE-EM i glifosat POSTEM,
(3) acetohlor i dikamba PRE-EM i glifosat i dikamba POST-EM i (4) acetohlor i fomesafen
kao PRE-EM i acetohlor, glifosat i dikamba kao POST-EM. Korovi su uklanjani kada je soja bila u
fazama: V1, V3, V6, R2 i R5, a pored njih su postojale kontrole sa korovima i kontrole na kojima su korovi uklanjani tokom čitave vegetacione sezone. Primenom tretmana (2, 3 i 4) kritični
momenat suzbijanja korova je bio pomeren za 632, 861 i 1060 SAT (suma aktivnih temperatura
vazduha), tj. do V4, V6 i R1 faze razvoja soje, odnosno 28, 32 i 42 dana nakon nicanja.
Ključne reči: PRE-EM herbicidi, kritično vreme suzbijanja korova, rezistentnost na glifosat,
integralno suzbijanje korova.
PB  - Beograd : Herbološko društvo
T2  - Acta herbologica
T1  - Critical time for weed removal in dicamba tolerant soybean as influenced by pre emergence herbicides
T1  - Uticaj pre-em primene herbicida na kritično vreme suzbijanja korova u soji tolerantnoj na dikambu
EP  - 62
IS  - 1
SP  - 55
VL  - 29
DO  - 10.5937/ActaHerb2001055J
ER  - 

@article{
author = "Jovanović, Darko and Cuvaca, Ivan and Knežević, Stevan",
year = "2020",
abstract = "Field experiment was conducted in 2019 at Haskell Agriculture Laboratory, Concord, NE, USA. Goal of the study was to test the influence of PRE-EM herbicides on the Critical Time for Weed Removal (CTWR) in dicamba-tolerant soybean. The study was arranged in a split-plot design which consisted of four herbicide regimes as main plot treatments and seven weed removal timings as subplot treatments, with four replications. The herbicide regimes included: (1) no PRE and glyphosate, (2) acetochlor and dicamba as PRE and glyphosate as POST, (3) acetochlor and dicamba as PRE and glyphosate and dicamba as POST, and (4) acetochlor and fomesafen as PRE and acetochlor, glyphosate and dicamba as POST. The five weed removal times included the V1, V3, V6, R2 and R5, and there were also weedy and weed-free season long plots. By utilizing herbicide regimes, the CTWR was delayed to 632 GDD (until V4 soybean growth stage, 28 days after emergence) for acetochlor and dicamba as PRE and glyphosate as POST, 861 GDD (until V6 soybean growth stage, 32 days after emergence) for acetochlor and dicamba as PRE and glyphosate and dicamba as POST, and 1060 GDD (until R1 soybean growth stage, 42 days after emergence) for acetochlor and fomesafen as PRE and acetochlor, glyphosate and dicamba as POST., Ogled je sproveden 2019. godine u Haskell Agricalture Laboratory, Concord, NE, USA. Cilj
ogleda bio je da se utvrdi uticaj PRE-EM herbicida na kritičan momenat suzbijanja korova u usevu
soje tolerantne na dikambu. Ogled je postavljen kao potpuno slučajan blok sistem sa 28 tretmana
(4 herbicidna tretmana sa 7 različitih vremena uklanjanja korova) u 4 ponavljanja. Primenjeni
herbicidni tretmani su: (1) glifosat POST-EM, (2) acetohlor i dikamba PRE-EM i glifosat POSTEM,
(3) acetohlor i dikamba PRE-EM i glifosat i dikamba POST-EM i (4) acetohlor i fomesafen
kao PRE-EM i acetohlor, glifosat i dikamba kao POST-EM. Korovi su uklanjani kada je soja bila u
fazama: V1, V3, V6, R2 i R5, a pored njih su postojale kontrole sa korovima i kontrole na kojima su korovi uklanjani tokom čitave vegetacione sezone. Primenom tretmana (2, 3 i 4) kritični
momenat suzbijanja korova je bio pomeren za 632, 861 i 1060 SAT (suma aktivnih temperatura
vazduha), tj. do V4, V6 i R1 faze razvoja soje, odnosno 28, 32 i 42 dana nakon nicanja.
Ključne reči: PRE-EM herbicidi, kritično vreme suzbijanja korova, rezistentnost na glifosat,
integralno suzbijanje korova.",
publisher = "Beograd : Herbološko društvo",
journal = "Acta herbologica",
title = "Critical time for weed removal in dicamba tolerant soybean as influenced by pre emergence herbicides, Uticaj pre-em primene herbicida na kritično vreme suzbijanja korova u soji tolerantnoj na dikambu",
pages = "62-55",
number = "1",
volume = "29",
doi = "10.5937/ActaHerb2001055J"
}

Jovanović, D., Cuvaca, I.,& Knežević, S.. (2020). Critical time for weed removal in dicamba tolerant soybean as influenced by pre emergence herbicides. in Acta herbologica
Beograd : Herbološko društvo., 29(1), 55-62.
https://doi.org/10.5937/ActaHerb2001055J

Jovanović D, Cuvaca I, Knežević S. Critical time for weed removal in dicamba tolerant soybean as influenced by pre emergence herbicides. in Acta herbologica. 2020;29(1):55-62.
doi:10.5937/ActaHerb2001055J .

Jovanović, Darko, Cuvaca, Ivan, Knežević, Stevan, "Critical time for weed removal in dicamba tolerant soybean as influenced by pre emergence herbicides" in Acta herbologica, 29, no. 1 (2020):55-62,
https://doi.org/10.5937/ActaHerb2001055J . .

TY  - CONF
AU  - Scott, Jon
AU  - Knežević, Stevan
AU  - Jovanović, Darko
AU  - Cuvaca, Ivan
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/836
AB  - 2,4-D applied to 2,4-D-resistant crops may drift and injure 2,4-D susceptible crops. A field study examined the influence of 2,4-D drift on yield and yield loss of glufosinate-tolerant soybean. 2,4-D drift was simulated by applying six micro-doses of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide to glufosinate-tolerant (GT) soybean at three contrasting growth stages[second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)]. Visual evaluation of GT soybean injury was conducted at 7, 14 and 21 days after treatment (DAT). GT soybean yield was also collected. Increase in 2,4-D micro-doses significantly increased GT soybean injury and reduced yield regardless of growth stage at time of 2,4-D application. 2,4-D doses between 1/100 to 1/50 of the label recommended rate caused 5-20% injury to GT soybean. GT soybean was more sensitive to 2,4-D injury at R2 than the V2 and R1 stages. 34.79 g ae ha-1 of 2,4-D caused 5% injury to GT soybean at R2 compared with a 1.4- and 1.8-fold higher dose required to cause the same level of injury at the V2 and R1 stage, respectively. With respect to yield reduction, the R2 stage was also the most sensitive. Preliminary data analysis showed that 2,4-D dose of 0.33 g ae ha-1 reduced GT soybean yield at R2 by 5% (0.2 Mg ha-1) compared with a 10.3- and 26.3-fold higher dose at the V2 and R1 stage, respectively. These results clearly show that GT soybean is sensitive to 2,4-D especially at reproductive stages and therefore 2,4-D drift should be prevented in order to prevent yield losses.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Yield and Yield Loss of Glufosinate-Tolerant Soybean as Influenced by 2,4-D
SP  - 42
UR  - https://hdl.handle.net/21.15107/rcub_rivec_836
ER  - 

@conference{
author = "Scott, Jon and Knežević, Stevan and Jovanović, Darko and Cuvaca, Ivan",
year = "2019",
abstract = "2,4-D applied to 2,4-D-resistant crops may drift and injure 2,4-D susceptible crops. A field study examined the influence of 2,4-D drift on yield and yield loss of glufosinate-tolerant soybean. 2,4-D drift was simulated by applying six micro-doses of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide to glufosinate-tolerant (GT) soybean at three contrasting growth stages[second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)]. Visual evaluation of GT soybean injury was conducted at 7, 14 and 21 days after treatment (DAT). GT soybean yield was also collected. Increase in 2,4-D micro-doses significantly increased GT soybean injury and reduced yield regardless of growth stage at time of 2,4-D application. 2,4-D doses between 1/100 to 1/50 of the label recommended rate caused 5-20% injury to GT soybean. GT soybean was more sensitive to 2,4-D injury at R2 than the V2 and R1 stages. 34.79 g ae ha-1 of 2,4-D caused 5% injury to GT soybean at R2 compared with a 1.4- and 1.8-fold higher dose required to cause the same level of injury at the V2 and R1 stage, respectively. With respect to yield reduction, the R2 stage was also the most sensitive. Preliminary data analysis showed that 2,4-D dose of 0.33 g ae ha-1 reduced GT soybean yield at R2 by 5% (0.2 Mg ha-1) compared with a 10.3- and 26.3-fold higher dose at the V2 and R1 stage, respectively. These results clearly show that GT soybean is sensitive to 2,4-D especially at reproductive stages and therefore 2,4-D drift should be prevented in order to prevent yield losses.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Yield and Yield Loss of Glufosinate-Tolerant Soybean as Influenced by 2,4-D",
pages = "42",
url = "https://hdl.handle.net/21.15107/rcub_rivec_836"
}

Scott, J., Knežević, S., Jovanović, D.,& Cuvaca, I.. (2019). Yield and Yield Loss of Glufosinate-Tolerant Soybean as Influenced by 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 42.
https://hdl.handle.net/21.15107/rcub_rivec_836

Scott J, Knežević S, Jovanović D, Cuvaca I. Yield and Yield Loss of Glufosinate-Tolerant Soybean as Influenced by 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:42.
https://hdl.handle.net/21.15107/rcub_rivec_836 .

Scott, Jon, Knežević, Stevan, Jovanović, Darko, Cuvaca, Ivan, "Yield and Yield Loss of Glufosinate-Tolerant Soybean as Influenced by 2,4-D" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):42,
https://hdl.handle.net/21.15107/rcub_rivec_836 .

TY  - CONF
AU  - Scott, Jon
AU  - Knežević, Stevan
AU  - Jovanović, Darko
AU  - Cuvaca, Ivan
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/835
AB  - 2,4-D is one of the most widely used herbicides; however, there is a concern associated with its propensity to drift onto non-2,4-D tolerant crops. A study was conducted in 2019 near Concord, NE to investigate sensitivity of glufosinate-tolerant (GT) soybean to micro-rates of 2,4-D applied at contrasting growth stages. The study used a randomized complete block design (RCBD) with eight replications and a split-plot arrangement. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Soybean injury and plant height measurements were collected at 7, 14 and 21 days after treatment (DAT). Number of days to canopy closure was also recorded. Increase in 2,4-D dose significantly increased GT soybean injury and reduced plant height. Less than 1/100 of the label recommended dose of 2,4-D caused 5% injury to GT soybean irrespective of application time. GT soybean was more sensitive to 2,4-D injury at R2 than the V2 and R1 stages. 34.79 g ae ha-1 of 2,4-D caused 5% injury to GT soybean at R2 compared with a 1.4- and 1.8-fold higher dose required to cause the same level of injury at the V2 and R1 stage, respectively. With respect to plant height reduction, GT soybean was more sensitive to 2,4-D at V2 than the R1 and R2 stages. A 2,4-D dose of 3.9 g ae ha-1 reduced plant height at V2 stage by 5% (3.7 cm) compared with a 2.1- and 1.7-fold higher dose at the R1 and R2 stage, respectively. Increase in 2,4-D dose not only increased GT soybean injury and reduced plant height but also delayed canopy closure. 0.35 g ae ha-1 of 2,4-D delayed canopy closure of GT soybean at R2 stage by 5 days compared with a 11.9- and 8.4-fold higher dose at the V2 and R1 stage, respectively. These results show that GT soybean is sensitive to micro-rates of 2,4-D especially at the R2 stage; therefore, 2,4-D drift should be avoided especially at the reproductive stage.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Sensitivity of Glufosinate-Tolerant Soybean to Micro-Rates of 2,4-D
SP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_rivec_835
ER  - 

@conference{
author = "Scott, Jon and Knežević, Stevan and Jovanović, Darko and Cuvaca, Ivan",
year = "2019",
abstract = "2,4-D is one of the most widely used herbicides; however, there is a concern associated with its propensity to drift onto non-2,4-D tolerant crops. A study was conducted in 2019 near Concord, NE to investigate sensitivity of glufosinate-tolerant (GT) soybean to micro-rates of 2,4-D applied at contrasting growth stages. The study used a randomized complete block design (RCBD) with eight replications and a split-plot arrangement. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Soybean injury and plant height measurements were collected at 7, 14 and 21 days after treatment (DAT). Number of days to canopy closure was also recorded. Increase in 2,4-D dose significantly increased GT soybean injury and reduced plant height. Less than 1/100 of the label recommended dose of 2,4-D caused 5% injury to GT soybean irrespective of application time. GT soybean was more sensitive to 2,4-D injury at R2 than the V2 and R1 stages. 34.79 g ae ha-1 of 2,4-D caused 5% injury to GT soybean at R2 compared with a 1.4- and 1.8-fold higher dose required to cause the same level of injury at the V2 and R1 stage, respectively. With respect to plant height reduction, GT soybean was more sensitive to 2,4-D at V2 than the R1 and R2 stages. A 2,4-D dose of 3.9 g ae ha-1 reduced plant height at V2 stage by 5% (3.7 cm) compared with a 2.1- and 1.7-fold higher dose at the R1 and R2 stage, respectively. Increase in 2,4-D dose not only increased GT soybean injury and reduced plant height but also delayed canopy closure. 0.35 g ae ha-1 of 2,4-D delayed canopy closure of GT soybean at R2 stage by 5 days compared with a 11.9- and 8.4-fold higher dose at the V2 and R1 stage, respectively. These results show that GT soybean is sensitive to micro-rates of 2,4-D especially at the R2 stage; therefore, 2,4-D drift should be avoided especially at the reproductive stage.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Sensitivity of Glufosinate-Tolerant Soybean to Micro-Rates of 2,4-D",
pages = "40",
url = "https://hdl.handle.net/21.15107/rcub_rivec_835"
}

Scott, J., Knežević, S., Jovanović, D.,& Cuvaca, I.. (2019). Sensitivity of Glufosinate-Tolerant Soybean to Micro-Rates of 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 40.
https://hdl.handle.net/21.15107/rcub_rivec_835

Scott J, Knežević S, Jovanović D, Cuvaca I. Sensitivity of Glufosinate-Tolerant Soybean to Micro-Rates of 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:40.
https://hdl.handle.net/21.15107/rcub_rivec_835 .

Scott, Jon, Knežević, Stevan, Jovanović, Darko, Cuvaca, Ivan, "Sensitivity of Glufosinate-Tolerant Soybean to Micro-Rates of 2,4-D" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):40,
https://hdl.handle.net/21.15107/rcub_rivec_835 .

TY  - CONF
AU  - Cuvaca, Ivan
AU  - Knežević, Stevan
AU  - Jovanović, Darko
AU  - Scott, Jon
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/834
AB  - With the introduction of 2,4-D-tolerant crops, the use of 2,4-D and the risk of drift in non-2,4-D tolerant crops including soybean are likely to increase. To understand the impact of 2,4-D drift on glyphosate-tolerant (GT) soybean, a study using a randomized complete block design with four replications and a split-plot arrangement of treatments was conducted in 2019 near Concord, NE. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Soybean injury was visually assessed at 7, 14 and 21 days after treatment (DAT). Grain yield was also collected using a small-plot combine. In general, there was an increase in soybean injury and reduction in grain yield with increase in 2,4-D dose. GT soybean was more sensitive to 2,4-D injury at R2 than V2 and R1 stages. Less than 1/10 of the label recommended dose of 2,4-D caused 5-20% injury to GT soybean. Based on estimates of the effective dose of 2,4-D required to cause 5% injury, GT soybean was 1.4- and 1.2-fold more sensitive to 2,4-D at R2 (44.88 g ae ha-1) than V2 (61.78 g ae ha-1) and R1 (53.12 g ae ha-1) stage, respectively. This increase in GT soybean sensitivity to 2,4-D injury has ultimately resulted in a significant reduction in grain yield especially at the R2 stage. Preliminary data analysis showed that 2,4-D dose of 0.33 g ae ha-1 reduced GT soybean yield at R2 by 5% (0.22 Mg ha-1) compared with 54.58 and 1.77 g ae ha-1 at the V2 and R1 stage, respectively. These results show that 2,4-D drift poses a risk to GT soybean and can result in significant yield losses; therefore, it is crucial that 2,4-D drift is prevented especially at the R2 stage.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Glyphosate-Tolerant Soybean Yield Loss and Yield Response to Micro-Rates of 2,4-D as Influenced by Growth Stage
SP  - 38
UR  - https://hdl.handle.net/21.15107/rcub_rivec_834
ER  - 

@conference{
author = "Cuvaca, Ivan and Knežević, Stevan and Jovanović, Darko and Scott, Jon",
year = "2019",
abstract = "With the introduction of 2,4-D-tolerant crops, the use of 2,4-D and the risk of drift in non-2,4-D tolerant crops including soybean are likely to increase. To understand the impact of 2,4-D drift on glyphosate-tolerant (GT) soybean, a study using a randomized complete block design with four replications and a split-plot arrangement of treatments was conducted in 2019 near Concord, NE. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Soybean injury was visually assessed at 7, 14 and 21 days after treatment (DAT). Grain yield was also collected using a small-plot combine. In general, there was an increase in soybean injury and reduction in grain yield with increase in 2,4-D dose. GT soybean was more sensitive to 2,4-D injury at R2 than V2 and R1 stages. Less than 1/10 of the label recommended dose of 2,4-D caused 5-20% injury to GT soybean. Based on estimates of the effective dose of 2,4-D required to cause 5% injury, GT soybean was 1.4- and 1.2-fold more sensitive to 2,4-D at R2 (44.88 g ae ha-1) than V2 (61.78 g ae ha-1) and R1 (53.12 g ae ha-1) stage, respectively. This increase in GT soybean sensitivity to 2,4-D injury has ultimately resulted in a significant reduction in grain yield especially at the R2 stage. Preliminary data analysis showed that 2,4-D dose of 0.33 g ae ha-1 reduced GT soybean yield at R2 by 5% (0.22 Mg ha-1) compared with 54.58 and 1.77 g ae ha-1 at the V2 and R1 stage, respectively. These results show that 2,4-D drift poses a risk to GT soybean and can result in significant yield losses; therefore, it is crucial that 2,4-D drift is prevented especially at the R2 stage.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Glyphosate-Tolerant Soybean Yield Loss and Yield Response to Micro-Rates of 2,4-D as Influenced by Growth Stage",
pages = "38",
url = "https://hdl.handle.net/21.15107/rcub_rivec_834"
}

Cuvaca, I., Knežević, S., Jovanović, D.,& Scott, J.. (2019). Glyphosate-Tolerant Soybean Yield Loss and Yield Response to Micro-Rates of 2,4-D as Influenced by Growth Stage. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 38.
https://hdl.handle.net/21.15107/rcub_rivec_834

Cuvaca I, Knežević S, Jovanović D, Scott J. Glyphosate-Tolerant Soybean Yield Loss and Yield Response to Micro-Rates of 2,4-D as Influenced by Growth Stage. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:38.
https://hdl.handle.net/21.15107/rcub_rivec_834 .

Cuvaca, Ivan, Knežević, Stevan, Jovanović, Darko, Scott, Jon, "Glyphosate-Tolerant Soybean Yield Loss and Yield Response to Micro-Rates of 2,4-D as Influenced by Growth Stage" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):38,
https://hdl.handle.net/21.15107/rcub_rivec_834 .

TY  - CONF
AU  - Cuvaca, Ivan
AU  - Scott, Jon
AU  - Jovanović, Darko
AU  - Knežević, Stevan
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/833
AB  - Off-target movement of 2,4-D can cause severe injury to susceptible crops including non-2,4-D-tolerant crops. A field study was conducted in 2019 near Concord, NE to investigate the effect of growth stage on glyphosate-tolerant (GT) soybean sensitivity to micro-rates of 2,4-D. The experiment used a randomized complete block design (RCBD) with eight replications and a split-plot arrangement. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Soybean injury assessment and plant height measurements were performed at 7, 14 and 21 days after treatment (DAT). Number of days to canopy closure was also recorded. In general, increase in 2,4-D dose increased soybean injury and reduced plant height. Less than 1/10 of the label recommended dose of 2,4-D caused 5-20% injury to GT soybean regardless of application time; however, GT soybean was more sensitive to 2,4-D injury at R2 than the V2 and R1 stages. A 2,4-D dose of 44.88 g ae ha-1 caused 5% injury to GT soybean at the R2 stage compared with a 1.4- and 1.2-fold higher dose required to cause the same level of injury at the V2 and R1 stage, respectively. Plant height, on the other hand, was more sensitive to 2,4-D at R1 than the V2 and R2 stages. A dose of 2,4-D of 6.93 g ae ha-1 reduced plant height at R1 by 5% (3.7 cm) compared with a 1.5 (10.29 g ae ha-1) to 1.6 (11.22 g ae ha-1)-fold higher dose that was required to cause the same reduction in plant height at other growth stages. Because of this increase in GT soybean injury and reduction in plant height, there was a delay in canopy closure with a 2,4-D dose of 9.76, 3.53 and 3.81 g ae ha-1 resulting in a 5 day delay in canopy closure at V2, R1 and R2 stage, respectively. Altogether, these results show that GT soybean is sensitive to micro-rates of 2,4-D especially at the reproductive stages.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Effect of Growth Stage on Glyphosate-Tolerant Soybean Sensitivity to Micro-Rates of 2,4-D
SP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_rivec_833
ER  - 

@conference{
author = "Cuvaca, Ivan and Scott, Jon and Jovanović, Darko and Knežević, Stevan",
year = "2019",
abstract = "Off-target movement of 2,4-D can cause severe injury to susceptible crops including non-2,4-D-tolerant crops. A field study was conducted in 2019 near Concord, NE to investigate the effect of growth stage on glyphosate-tolerant (GT) soybean sensitivity to micro-rates of 2,4-D. The experiment used a randomized complete block design (RCBD) with eight replications and a split-plot arrangement. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Soybean injury assessment and plant height measurements were performed at 7, 14 and 21 days after treatment (DAT). Number of days to canopy closure was also recorded. In general, increase in 2,4-D dose increased soybean injury and reduced plant height. Less than 1/10 of the label recommended dose of 2,4-D caused 5-20% injury to GT soybean regardless of application time; however, GT soybean was more sensitive to 2,4-D injury at R2 than the V2 and R1 stages. A 2,4-D dose of 44.88 g ae ha-1 caused 5% injury to GT soybean at the R2 stage compared with a 1.4- and 1.2-fold higher dose required to cause the same level of injury at the V2 and R1 stage, respectively. Plant height, on the other hand, was more sensitive to 2,4-D at R1 than the V2 and R2 stages. A dose of 2,4-D of 6.93 g ae ha-1 reduced plant height at R1 by 5% (3.7 cm) compared with a 1.5 (10.29 g ae ha-1) to 1.6 (11.22 g ae ha-1)-fold higher dose that was required to cause the same reduction in plant height at other growth stages. Because of this increase in GT soybean injury and reduction in plant height, there was a delay in canopy closure with a 2,4-D dose of 9.76, 3.53 and 3.81 g ae ha-1 resulting in a 5 day delay in canopy closure at V2, R1 and R2 stage, respectively. Altogether, these results show that GT soybean is sensitive to micro-rates of 2,4-D especially at the reproductive stages.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Effect of Growth Stage on Glyphosate-Tolerant Soybean Sensitivity to Micro-Rates of 2,4-D",
pages = "36",
url = "https://hdl.handle.net/21.15107/rcub_rivec_833"
}

Cuvaca, I., Scott, J., Jovanović, D.,& Knežević, S.. (2019). Effect of Growth Stage on Glyphosate-Tolerant Soybean Sensitivity to Micro-Rates of 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 36.
https://hdl.handle.net/21.15107/rcub_rivec_833

Cuvaca I, Scott J, Jovanović D, Knežević S. Effect of Growth Stage on Glyphosate-Tolerant Soybean Sensitivity to Micro-Rates of 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:36.
https://hdl.handle.net/21.15107/rcub_rivec_833 .

Cuvaca, Ivan, Scott, Jon, Jovanović, Darko, Knežević, Stevan, "Effect of Growth Stage on Glyphosate-Tolerant Soybean Sensitivity to Micro-Rates of 2,4-D" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):36,
https://hdl.handle.net/21.15107/rcub_rivec_833 .

TY  - CONF
AU  - Jovanović, Darko
AU  - Knežević, Stevan
AU  - Scott, Jon
AU  - Cuvaca, Ivan
AU  - Pavlović, Pavle
AU  - Osipitan, Adewale
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/830
AB  - Dicamba-tolerant soybeans were developed to provide an alternative herbicide mode of action with the use of dicamba for weed control in soybean and to manage herbicide-resistant broadleaf weed species. Residual herbicides can influence how weeds compete with the crop. Thus, they can potentially extend the critical time of weed removal (CTWR) to later in the season. Field experiment was conducted in 2018 and 2019 at Haskell Ag Lab, Concord in Nebraska. The experiment was laid out in a split-plot arrangement of 28 treatments (4 herbicide regimes and 7 weed removal timings) with four replicates. The 4 herbicide regimes were different combinations of PRE and POST treatments. These combinations were: (1) No PRE with POST Roundup PowerMax® (glyphosate), (2) PRE Warrant® (acetochlor) and XtendiMAX® (dicamba) with POST Roundup PowerMax®, (3) PRE Warrant® and XtendiMax® with POST Roundup PowerMax® and XtendiMax®, and PRE Warrant Ultra® (acetochlor plus fomesafen) with POST Warrant®, Roundup PowerMax® and XtendiMax®. The 7 weed removal timings were: V1, V3, V6, R2 and R5 soybean growth stage, as well as weed free and weedy season long. The CTWR (based on 5% acceptable yield loss) started at V2 soybean stage in plots without residual herbicide application. The application of residual herbicides extended the CTWR to V4, V6 or R2 depending on the type of residual herbicide applied. The greatest extension of CTWR (R2) was achieved with the PRE application of Warant Ultra® complemented with POST application of Roundup PowerMax® tank-mixed with XtendiMax®. The least extension of CTWR (V4) was provided by PRE application of Warant® and XtendiMax® complemented with POST application of Roundup PowerMax®. In general, it can be concluded that application of residual herbicides in dicamba-tolerant soybeans clearly extended the CTWR.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Extending Critical Time of Weed Removal in Dicamba-Tolerant Soybean with Residual Herbicides
SP  - 28
UR  - https://hdl.handle.net/21.15107/rcub_rivec_830
ER  - 

@conference{
author = "Jovanović, Darko and Knežević, Stevan and Scott, Jon and Cuvaca, Ivan and Pavlović, Pavle and Osipitan, Adewale",
year = "2019",
abstract = "Dicamba-tolerant soybeans were developed to provide an alternative herbicide mode of action with the use of dicamba for weed control in soybean and to manage herbicide-resistant broadleaf weed species. Residual herbicides can influence how weeds compete with the crop. Thus, they can potentially extend the critical time of weed removal (CTWR) to later in the season. Field experiment was conducted in 2018 and 2019 at Haskell Ag Lab, Concord in Nebraska. The experiment was laid out in a split-plot arrangement of 28 treatments (4 herbicide regimes and 7 weed removal timings) with four replicates. The 4 herbicide regimes were different combinations of PRE and POST treatments. These combinations were: (1) No PRE with POST Roundup PowerMax® (glyphosate), (2) PRE Warrant® (acetochlor) and XtendiMAX® (dicamba) with POST Roundup PowerMax®, (3) PRE Warrant® and XtendiMax® with POST Roundup PowerMax® and XtendiMax®, and PRE Warrant Ultra® (acetochlor plus fomesafen) with POST Warrant®, Roundup PowerMax® and XtendiMax®. The 7 weed removal timings were: V1, V3, V6, R2 and R5 soybean growth stage, as well as weed free and weedy season long. The CTWR (based on 5% acceptable yield loss) started at V2 soybean stage in plots without residual herbicide application. The application of residual herbicides extended the CTWR to V4, V6 or R2 depending on the type of residual herbicide applied. The greatest extension of CTWR (R2) was achieved with the PRE application of Warant Ultra® complemented with POST application of Roundup PowerMax® tank-mixed with XtendiMax®. The least extension of CTWR (V4) was provided by PRE application of Warant® and XtendiMax® complemented with POST application of Roundup PowerMax®. In general, it can be concluded that application of residual herbicides in dicamba-tolerant soybeans clearly extended the CTWR.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Extending Critical Time of Weed Removal in Dicamba-Tolerant Soybean with Residual Herbicides",
pages = "28",
url = "https://hdl.handle.net/21.15107/rcub_rivec_830"
}

Jovanović, D., Knežević, S., Scott, J., Cuvaca, I., Pavlović, P.,& Osipitan, A.. (2019). Extending Critical Time of Weed Removal in Dicamba-Tolerant Soybean with Residual Herbicides. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 28.
https://hdl.handle.net/21.15107/rcub_rivec_830

Jovanović D, Knežević S, Scott J, Cuvaca I, Pavlović P, Osipitan A. Extending Critical Time of Weed Removal in Dicamba-Tolerant Soybean with Residual Herbicides. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:28.
https://hdl.handle.net/21.15107/rcub_rivec_830 .

Jovanović, Darko, Knežević, Stevan, Scott, Jon, Cuvaca, Ivan, Pavlović, Pavle, Osipitan, Adewale, "Extending Critical Time of Weed Removal in Dicamba-Tolerant Soybean with Residual Herbicides" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):28,
https://hdl.handle.net/21.15107/rcub_rivec_830 .

TY  - CONF
AU  - Cuvaca, Ivan
AU  - Knežević, Stevan
AU  - Jovanović, Darko
AU  - Scott, Jon
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/832
AB  - With the recent launching of Enlist E3 soybean in the U.S., 2,4-D use is likely to increase. An experiment laid out in a randomized complete block design with a split-plot arrangement and eight replications was conducted to study the influence of 2,4-D on conventional soybean growth and sensitivity. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Visual injury and plant height were measured at 7, 14 and 21 days after treatment (DAT). Number of days to canopy closure was also recorded. Results showed an increase in soybean injury and reduction in plant height with increase in 2,4-D dose. Based on estimates of the effective dose of 2,4-D required to cause 5% injury, soybean sensitivity to 2,4-D was 1.2 (39.62 g ae ha-1)-fold higher at R2 than the V2 and R1 stages. 2,4-D dose of 6.64-11.72 g ae ha-1 reduced conventional soybean height by 5% (3.7 cm) regardless of application time. This reduction in plant height has ultimately delayed soybean canopy closure. A 2,4-D dose of 7.94, 1.27 and 15.31 g ae ha-1 delayed canopy closure by 5 days at the V2, R1 and R2 stage, respectively. In general, these results show that 2,4-D influences conventional soybean growth and sensitivity the most at the R1 stage; therefore, late-season 2,4-D drift should be avoided.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Conventional Soybean Growth and Sensitivity as Influenced by 2,4-D
SP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_rivec_832
ER  - 

@conference{
author = "Cuvaca, Ivan and Knežević, Stevan and Jovanović, Darko and Scott, Jon",
year = "2019",
abstract = "With the recent launching of Enlist E3 soybean in the U.S., 2,4-D use is likely to increase. An experiment laid out in a randomized complete block design with a split-plot arrangement and eight replications was conducted to study the influence of 2,4-D on conventional soybean growth and sensitivity. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Visual injury and plant height were measured at 7, 14 and 21 days after treatment (DAT). Number of days to canopy closure was also recorded. Results showed an increase in soybean injury and reduction in plant height with increase in 2,4-D dose. Based on estimates of the effective dose of 2,4-D required to cause 5% injury, soybean sensitivity to 2,4-D was 1.2 (39.62 g ae ha-1)-fold higher at R2 than the V2 and R1 stages. 2,4-D dose of 6.64-11.72 g ae ha-1 reduced conventional soybean height by 5% (3.7 cm) regardless of application time. This reduction in plant height has ultimately delayed soybean canopy closure. A 2,4-D dose of 7.94, 1.27 and 15.31 g ae ha-1 delayed canopy closure by 5 days at the V2, R1 and R2 stage, respectively. In general, these results show that 2,4-D influences conventional soybean growth and sensitivity the most at the R1 stage; therefore, late-season 2,4-D drift should be avoided.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Conventional Soybean Growth and Sensitivity as Influenced by 2,4-D",
pages = "34",
url = "https://hdl.handle.net/21.15107/rcub_rivec_832"
}

Cuvaca, I., Knežević, S., Jovanović, D.,& Scott, J.. (2019). Conventional Soybean Growth and Sensitivity as Influenced by 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 34.
https://hdl.handle.net/21.15107/rcub_rivec_832

Cuvaca I, Knežević S, Jovanović D, Scott J. Conventional Soybean Growth and Sensitivity as Influenced by 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:34.
https://hdl.handle.net/21.15107/rcub_rivec_832 .

Cuvaca, Ivan, Knežević, Stevan, Jovanović, Darko, Scott, Jon, "Conventional Soybean Growth and Sensitivity as Influenced by 2,4-D" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):34,
https://hdl.handle.net/21.15107/rcub_rivec_832 .

TY  - CONF
AU  - Cuvaca, Ivan
AU  - Scott, Jon
AU  - Jovanović, Darko
AU  - Knežević, Stevan
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/831
AB  - To stress investigations aimed at clarifying the impact of 2,4-D drift on non-2,4-D tolerant soybean, a study was conducted in 2019 near Concord, NE. Specifically, the study investigated the impact of 2,4-D micro-rates on conventional soybean yield. The experiment used a randomized complete block design with a split-plot arrangement and four replications. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Soybean injury was visually assessed at 7, 14 and 21 days after treatment (DAT), and grain was collected using a small-plot combine. In general, soybean injury increased with an increase in 2,4-D dose. R2 was more sensitive to 2,4-D injury than the V2 and R1 stages at 21 DAT. A 2,4-D dose of 39.6 g ae ha-1 caused 5% injury to conventional soybean at R2 stage compared with a 1.2-fold higher dose required to cause the same level of injury at both the V2 and R1 stages. In terms of yield reduction, the R1 stage was the most sensitive. Preliminary data analysis showed that 2,4-D dose of 1.97 g ae ha-1 reduced conventional soybean yield by 5% (0.2 Mg ha-1) at the R1 stage compared with 140.6 and 24.2 g ae ha-1 required to cause the same yield reduction at the V2 and R2 stage, respectively. Overall, these results show that conventional soybean is more sensitive to 2,4-D at the reproductive stages and therefore preventing 2,4-D drift at such stages is crucial.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Yield and Yield Loss of Conventional Soybean as Influenced by 2,4-D
SP  - 32
UR  - https://hdl.handle.net/21.15107/rcub_rivec_831
ER  - 

@conference{
author = "Cuvaca, Ivan and Scott, Jon and Jovanović, Darko and Knežević, Stevan",
year = "2019",
abstract = "To stress investigations aimed at clarifying the impact of 2,4-D drift on non-2,4-D tolerant soybean, a study was conducted in 2019 near Concord, NE. Specifically, the study investigated the impact of 2,4-D micro-rates on conventional soybean yield. The experiment used a randomized complete block design with a split-plot arrangement and four replications. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Soybean injury was visually assessed at 7, 14 and 21 days after treatment (DAT), and grain was collected using a small-plot combine. In general, soybean injury increased with an increase in 2,4-D dose. R2 was more sensitive to 2,4-D injury than the V2 and R1 stages at 21 DAT. A 2,4-D dose of 39.6 g ae ha-1 caused 5% injury to conventional soybean at R2 stage compared with a 1.2-fold higher dose required to cause the same level of injury at both the V2 and R1 stages. In terms of yield reduction, the R1 stage was the most sensitive. Preliminary data analysis showed that 2,4-D dose of 1.97 g ae ha-1 reduced conventional soybean yield by 5% (0.2 Mg ha-1) at the R1 stage compared with 140.6 and 24.2 g ae ha-1 required to cause the same yield reduction at the V2 and R2 stage, respectively. Overall, these results show that conventional soybean is more sensitive to 2,4-D at the reproductive stages and therefore preventing 2,4-D drift at such stages is crucial.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Yield and Yield Loss of Conventional Soybean as Influenced by 2,4-D",
pages = "32",
url = "https://hdl.handle.net/21.15107/rcub_rivec_831"
}

Cuvaca, I., Scott, J., Jovanović, D.,& Knežević, S.. (2019). Yield and Yield Loss of Conventional Soybean as Influenced by 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 32.
https://hdl.handle.net/21.15107/rcub_rivec_831

Cuvaca I, Scott J, Jovanović D, Knežević S. Yield and Yield Loss of Conventional Soybean as Influenced by 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:32.
https://hdl.handle.net/21.15107/rcub_rivec_831 .

Cuvaca, Ivan, Scott, Jon, Jovanović, Darko, Knežević, Stevan, "Yield and Yield Loss of Conventional Soybean as Influenced by 2,4-D" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):32,
https://hdl.handle.net/21.15107/rcub_rivec_831 .

TY  - CONF
AU  - Knežević, Stevan
AU  - Scott, Jon
AU  - Jovanović, Darko
AU  - Cuvaca, Ivan
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/829
AB  - There are speculations that a drift of sub-lethal or ultra-low doses of dicamba herbicides to soybean can increase the yield through the phenomenon called hormesis. Thus, there is a need to evaluate the impact of ultra micro-rates of dicamba on yields of sensitive soybean. Field study was conducted in 2018 and 2019 at Concord, NE. The study was arranged as a split-plot design with ten dicamba micro-rates, 3 application times and 4 replications. Dicamba rates included 0; 1/10; 1/100; 1/1000; 1/5000; 1/10000; 1/20000; 1/30000; 1/40000 and 1/50000 of the 560 g ae ha-1 (label rate) of XtendiMax. The 3 application times were V2 (2nd trifoliate), R1 (beginning of flowering) and R2 (full flowering) stages of soybean development. Application of 1/5000 to 1/10 of dicamba label rate caused 20 to 80% visual injury with the greatest injury at R1. A 1/10 of the dicamba label rate could cause 23 to 78% soybean yield loss depending on the growth stage of exposure; with the greatest yield loss (78%) at the R1 stage. In general, our preliminary study suggested that there was no evidence that sub-lethal doses of dicamba could increase the yield of soybean irrespective of the growth stage of dicamba exposure, suggesting that there is no hormesis occurring.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?
SP  - 27
UR  - https://hdl.handle.net/21.15107/rcub_rivec_829
ER  - 

@conference{
author = "Knežević, Stevan and Scott, Jon and Jovanović, Darko and Cuvaca, Ivan",
year = "2019",
abstract = "There are speculations that a drift of sub-lethal or ultra-low doses of dicamba herbicides to soybean can increase the yield through the phenomenon called hormesis. Thus, there is a need to evaluate the impact of ultra micro-rates of dicamba on yields of sensitive soybean. Field study was conducted in 2018 and 2019 at Concord, NE. The study was arranged as a split-plot design with ten dicamba micro-rates, 3 application times and 4 replications. Dicamba rates included 0; 1/10; 1/100; 1/1000; 1/5000; 1/10000; 1/20000; 1/30000; 1/40000 and 1/50000 of the 560 g ae ha-1 (label rate) of XtendiMax. The 3 application times were V2 (2nd trifoliate), R1 (beginning of flowering) and R2 (full flowering) stages of soybean development. Application of 1/5000 to 1/10 of dicamba label rate caused 20 to 80% visual injury with the greatest injury at R1. A 1/10 of the dicamba label rate could cause 23 to 78% soybean yield loss depending on the growth stage of exposure; with the greatest yield loss (78%) at the R1 stage. In general, our preliminary study suggested that there was no evidence that sub-lethal doses of dicamba could increase the yield of soybean irrespective of the growth stage of dicamba exposure, suggesting that there is no hormesis occurring.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?",
pages = "27",
url = "https://hdl.handle.net/21.15107/rcub_rivec_829"
}

Knežević, S., Scott, J., Jovanović, D.,& Cuvaca, I.. (2019). Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 27.
https://hdl.handle.net/21.15107/rcub_rivec_829

Knežević S, Scott J, Jovanović D, Cuvaca I. Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:27.
https://hdl.handle.net/21.15107/rcub_rivec_829 .

Knežević, Stevan, Scott, Jon, Jovanović, Darko, Cuvaca, Ivan, "Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):27,
https://hdl.handle.net/21.15107/rcub_rivec_829 .

TY  - CONF
AU  - Knežević, Stevan
AU  - Scott, John
AU  - Jovanović, Darko
AU  - Cuvaca, Ivan
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/827
AB  - 2,4-D is prone to drift. This raises a concern regarding potential damage to non 2,4-D-tolerant soybean. The objective of this study was to investigate the impact of 2,4-D micro-rates on growth and sensitivity of dicamba-tolerant (DT) soybean. A randomized complete block design with a split-plot arrangement and eight replications was used. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Visual injury assessment and plant height measurement were performed at 7, 14 and 21 days after treatment (DAT). Number of days to canopy closure was also recorded. Increase in 2,4-D dose increased soybean injury and reduced plant height regardless of application time. Soybean was 1.9- and 2.6-times more sensitive to 2,4-D injury at V2 and R2 stage, respectively, than the R1 stage; however, plant height reduction at the R1 stage was 4.4- and 2.6-fold that of the V2 and R2 stage, respectively. This reduction in plant height ultimately delayed canopy closure. For example, 0.89 g ae ha-1 of 2,4-D delayed canopy closure at R1 stage by 5 days and a 3.8 (3.40 g ae ha-1)- and 5.7 (5.09 g ae ha-1)-fold higher dose was required to delay canopy closure by same number of days (eg. 5 days) at the V2 and R2 stage, respectively. Leaf curling was more severe at both R1 and R2 than the V2 stage. Altogether, these results show that DT soybean is sensitive to micro-rates of 2,4-D especially at the onset of the reproductive stage (R1). Therefore, late 2,4-D applications should be avoided to prevent potential interference with pod formation and ultimately yield.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Growth and Sensitivity of Dicamba-Tolerant Soybean to Micro-Rates of 2,4-D
SP  - 23
VL  - 74
UR  - https://hdl.handle.net/21.15107/rcub_rivec_827
ER  - 

@conference{
author = "Knežević, Stevan and Scott, John and Jovanović, Darko and Cuvaca, Ivan",
year = "2019",
abstract = "2,4-D is prone to drift. This raises a concern regarding potential damage to non 2,4-D-tolerant soybean. The objective of this study was to investigate the impact of 2,4-D micro-rates on growth and sensitivity of dicamba-tolerant (DT) soybean. A randomized complete block design with a split-plot arrangement and eight replications was used. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Visual injury assessment and plant height measurement were performed at 7, 14 and 21 days after treatment (DAT). Number of days to canopy closure was also recorded. Increase in 2,4-D dose increased soybean injury and reduced plant height regardless of application time. Soybean was 1.9- and 2.6-times more sensitive to 2,4-D injury at V2 and R2 stage, respectively, than the R1 stage; however, plant height reduction at the R1 stage was 4.4- and 2.6-fold that of the V2 and R2 stage, respectively. This reduction in plant height ultimately delayed canopy closure. For example, 0.89 g ae ha-1 of 2,4-D delayed canopy closure at R1 stage by 5 days and a 3.8 (3.40 g ae ha-1)- and 5.7 (5.09 g ae ha-1)-fold higher dose was required to delay canopy closure by same number of days (eg. 5 days) at the V2 and R2 stage, respectively. Leaf curling was more severe at both R1 and R2 than the V2 stage. Altogether, these results show that DT soybean is sensitive to micro-rates of 2,4-D especially at the onset of the reproductive stage (R1). Therefore, late 2,4-D applications should be avoided to prevent potential interference with pod formation and ultimately yield.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Growth and Sensitivity of Dicamba-Tolerant Soybean to Micro-Rates of 2,4-D",
pages = "23",
volume = "74",
url = "https://hdl.handle.net/21.15107/rcub_rivec_827"
}

Knežević, S., Scott, J., Jovanović, D.,& Cuvaca, I.. (2019). Growth and Sensitivity of Dicamba-Tolerant Soybean to Micro-Rates of 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 74, 23.
https://hdl.handle.net/21.15107/rcub_rivec_827

Knežević S, Scott J, Jovanović D, Cuvaca I. Growth and Sensitivity of Dicamba-Tolerant Soybean to Micro-Rates of 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;74:23.
https://hdl.handle.net/21.15107/rcub_rivec_827 .

Knežević, Stevan, Scott, John, Jovanović, Darko, Cuvaca, Ivan, "Growth and Sensitivity of Dicamba-Tolerant Soybean to Micro-Rates of 2,4-D" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH, 74 (2019):23,
https://hdl.handle.net/21.15107/rcub_rivec_827 .

TY  - CONF
AU  - Knežević, Stevan
AU  - Scott, Jon
AU  - Jovanović, Darko
AU  - Cuvaca, Ivan
PY  - 2019
UR  - http://RIVeC.institut-palanka.rs/handle/123456789/828
AB  - Like other auxin herbicides, 2,4-D is typically associated with increased risk for drift-related damage to non-target crops. A study was conducted in 2019 near Concord, NE to investigate the impact of 2,4-D micro-rates on dicamba-tolerant (DT) soybean yield. The experiment used a randomized complete block design (RCBD) with four replications and a split-plot arrangement. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Crop injury was visually assessed at 7, 14 and 21 days after treatment (DAT). Grain yield was also collected. Increase in 2,4-D dose increased soybean injury and reduced yield. Less than 1/10 of the label recommended dose of 2,4-D caused 5-20% injury regardless of application time. V2 and R2 were 1.9- and 2.6-fold, respectively, more sensitive to 2,4-D injury than the R1 stage at 21 DAT. The effective dose of 2,4-D required to cause 5% soybean injury at 21 DAT at V2, R1 and R2 was 49.27, 94.26 and 36.59 g ae ha-1, respectively. In regards to yield reduction, the V2 and R1 stages were 4.2- and 3.5-fold, respectively, more sensitive to 2,4-D than the R2 stage. Preliminary data analysis showed that dose of 2,4-D of 7.17-8.72 g ae ha-1 reduced soybean yield by 5% (0.2 Mg ha-1) at the V2 and R1 stages. These results show that off-target movement of 2,4-D can significantly reduce soybean yield and therefore should be avoided.
PB  - North Central Weed Science Society (NCWSS)
C3  - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
T1  - Yield of Dicamba-Tolerant Soybean as Influenced by Micro-Rates of 2,4-D
SP  - 25
UR  - https://hdl.handle.net/21.15107/rcub_rivec_828
ER  - 

@conference{
author = "Knežević, Stevan and Scott, Jon and Jovanović, Darko and Cuvaca, Ivan",
year = "2019",
abstract = "Like other auxin herbicides, 2,4-D is typically associated with increased risk for drift-related damage to non-target crops. A study was conducted in 2019 near Concord, NE to investigate the impact of 2,4-D micro-rates on dicamba-tolerant (DT) soybean yield. The experiment used a randomized complete block design (RCBD) with four replications and a split-plot arrangement. Main plots consisted of three 2,4-D application times [second trifoliate (V2); beginning of flowering (V7/R1); and full flowering (R2)] and subplots consisted of six micro rates of 2,4-D (1/5; 1/10; 1/50; 1/100; 1/500; and 1/1000 of the label recommended dose of 1,120 g ae ha-1) and a check with no herbicide applied. Crop injury was visually assessed at 7, 14 and 21 days after treatment (DAT). Grain yield was also collected. Increase in 2,4-D dose increased soybean injury and reduced yield. Less than 1/10 of the label recommended dose of 2,4-D caused 5-20% injury regardless of application time. V2 and R2 were 1.9- and 2.6-fold, respectively, more sensitive to 2,4-D injury than the R1 stage at 21 DAT. The effective dose of 2,4-D required to cause 5% soybean injury at 21 DAT at V2, R1 and R2 was 49.27, 94.26 and 36.59 g ae ha-1, respectively. In regards to yield reduction, the V2 and R1 stages were 4.2- and 3.5-fold, respectively, more sensitive to 2,4-D than the R2 stage. Preliminary data analysis showed that dose of 2,4-D of 7.17-8.72 g ae ha-1 reduced soybean yield by 5% (0.2 Mg ha-1) at the V2 and R1 stages. These results show that off-target movement of 2,4-D can significantly reduce soybean yield and therefore should be avoided.",
publisher = "North Central Weed Science Society (NCWSS)",
journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH",
title = "Yield of Dicamba-Tolerant Soybean as Influenced by Micro-Rates of 2,4-D",
pages = "25",
url = "https://hdl.handle.net/21.15107/rcub_rivec_828"
}

Knežević, S., Scott, J., Jovanović, D.,& Cuvaca, I.. (2019). Yield of Dicamba-Tolerant Soybean as Influenced by Micro-Rates of 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH
North Central Weed Science Society (NCWSS)., 25.
https://hdl.handle.net/21.15107/rcub_rivec_828

Knežević S, Scott J, Jovanović D, Cuvaca I. Yield of Dicamba-Tolerant Soybean as Influenced by Micro-Rates of 2,4-D. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:25.
https://hdl.handle.net/21.15107/rcub_rivec_828 .

Knežević, Stevan, Scott, Jon, Jovanović, Darko, Cuvaca, Ivan, "Yield of Dicamba-Tolerant Soybean as Influenced by Micro-Rates of 2,4-D" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):25,
https://hdl.handle.net/21.15107/rcub_rivec_828 .