Control of glyphosate-resistant common waterhemp (Amaranthus tuberculatus var rudis) with dicamba and dimethenamid-P in Ontario

Schryver, Mike G.; Soltani, Nader; Hooker, David C.; Robinson, Darren E.; Tranel, Patrick J.; Sikkema, Peter H.

doi:10.1139/cjps-2017-0052

Cited by 5 publications

(6 citation statements)

References 6 publications

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“…This field study consisted of five site-years of trials, which included two sites (S2, S3) on Walpole Island, ON in 2018, one site (S4) on Walpole Island, ON in 2019 and one site near Cottam, ON, Canada in 2018 (S1) and 2019 (S5). MHR waterhemp resistant to ALS-, PS II-, EPSPS, and PPO-inhibiting herbicides was present at all field sites (Schryver et al, 2017). The classification and description of the soil types are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Over the past 18 years, waterhemp has spread across Ontario and is now present in 14 counties (Benoit et al, 2019a;Costea et al, 2005). Glyphosate-resistant (GR) waterhemp was first confirmed on Walpole Island, Ontario in 2014 (Schryver et al, 2017). Multiple-herbicide-resistant (MHR) waterhemp populations have since been identified in Ontario with four-way resistance to acetolactate synthase (ALS) (Group 2), photosystem II (PS II) (Group 5), 5-enolpyruyl shikimate-3-phosphate synthase (EPSPS) (Group 9) and protoporphyrinogen oxidase (PPO) (Group 14) inhibiting herbicides (Benoit et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

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Is There a Benefit of Adding Atrazine to HPPD-Inhibiting Herbicides for Control of Multiple-Herbicide-Resistant, Including Group 5-Resistant, Waterhemp in Corn?

Willemse¹,

Soltani²,

Benoit³

et al. 2021

JAS

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The evolution of multiple-herbicide-resistant (MHR) waterhemp (resistant to Groups 2, 5, 9, and 14) in Ontario, Canada is challenging for growers. The complementary activity of the co-application of hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicides with atrazine has been well documented. The objective of this research was to determine if the addition of atrazine to 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicides applied postemergence improves their consistency of MHR waterhemp (including Group 5 resistance) in corn. Five field trials were conducted over a two-year period (2018, 2019) in Ontario, Canada. Five HPPD-inhibiting herbicides [isoxaflutole (105 g ha-1), mesotrione (100 g ha-1), topramezone (12.5 g ha-1), tembotrione (90 g ha-1), and tolpyralate (30 g ha-1)] were applied postemergence with and without atrazine to 10-cm-tall waterhemp. Corn injury (≤ 10%) was observed at specific sites where the application of tembotrione, isoxaflutole and isoxaflutole + atrazine resulted in characteristic white bleaching of corn foliage; however, yield was not affected. Averaged across field sites, the addition of atrazine to isoxaflutole, mesotrione, topramezone, or tembotrione improved MHR waterhemp control 15%, 11%, 7%, and 7%, respectively at 4 weeks after application (WAA). Averaged across herbicide treatments and sites, the addition of atrazine reduced the standard error of MHR waterhemp control by 13% to 100%. This study concludes that the co-application of atrazine with HPPD-inhibitors applied postemergence reduced the risk of herbicide failure and resulted in greater and more consistent control of MHR waterhemp.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Is There a Benefit of Adding Atrazine to HPPD-Inhibiting Herbicides for Control of Multiple-Herbicide-Resistant, Including Group 5-Resistant, Waterhemp in Corn?

Willemse¹,

Soltani²,

Benoit³

et al. 2021

JAS

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“…Anderson et al [30], Soltani et al [16] and Vyn et al [31] reported dicamba/atrazine provided ≥86% control of herbicide-resistant waterhemp. Benoit et al [33] and Schryver et al [34] found that POST applications of dicamba are more effective than PRE applications. The application of a new glyphosate/2,4-D choline formulation registered for application to ENLIST TM (Corteva Agriscience, Wilmington, DE) corn hybrids allows for a second synthetic auxin herbicide for MHR waterhemp control in corn [34] [35] [36].…”

Section: Introductionmentioning

confidence: 99%

“…Benoit et al [33] and Schryver et al [34] found that POST applications of dicamba are more effective than PRE applications. The application of a new glyphosate/2,4-D choline formulation registered for application to ENLIST TM (Corteva Agriscience, Wilmington, DE) corn hybrids allows for a second synthetic auxin herbicide for MHR waterhemp control in corn [34] [35] [36]. ENLIST TM corn hybrids contain transgenes that confer resistance to glyphosate and glufosinate plus the aryloxyalkanoate dioxygenase-1 (AAD-1) transgene which enables them to exhibit resistance to glyphosate, glufosinate, and greater tolerance to 2,4-D and the arlyloxyphenoxy propionates than traditional glyphosate (RoundupReady ® ) (Bayer CropScience Inc., 160 Quarry Park Boulevard SE, Calgary, AB) and glufosinate (LibertyLink ® ) (BASF Canada Inc., 100 Milverton Drive, Mississauga, ON) resistant hybrids [35] [37] [38].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, Soltani et al[16] reported greater MHR waterhemp control and reductions in density and biomass with dicamba/atrazine (1800 g·ha −1 ) POST that were similar to mesotrione + atrazine POST and isoxaflutole + atrazine PRE in that study. Schryver et al[34] reported MHR waterhemp control with dicamba (600 g·ha −1 ) is greatest when applied POST resulting in 91% to 100% control compared to 60% to 65% at 10 WAA when applied PRE. Lower control with glyphosate + dicam-ba/atrazine may be due to lower dicamba application rate (504 g·ha −1 ).…”

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confidence: 99%

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Early Postemergence Herbicide Tank-Mixtures for Control of Waterhemp Resistant to Four Herbicide Modes of Action in Corn

Willemse¹,

Soltani²,

Benoit³

et al. 2021

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Multiple-herbicide-resistant (MHR) waterhemp has been confirmed and is difficult to control for growers in Ontario, Canada and in the Midwestern United States. The objective of this study was to evaluate early post-emergence (EPOST) herbicides for control of MHR waterhemp in field corn. Five field trials were conducted over a two-year period (2019, 2020) at sites on Walpole Island, ON and near Cottam, ON, Canada. Thirteen herbicide tank-mixtures containing multiple modes-of-action (MOA) were applied EPOST to 5 cm MHR waterhemp in field corn. Control of MHR waterhemp varied by site due to variable plant density, plant biomass, and number of herbicide-resistant individuals across research sites and years. Control of MHR waterhemp

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Control of glyphosate-resistant waterhemp with preemergence herbicides in glyphosate- and dicamba-resistant soybean

et al. 2019

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Glyphosate-resistant (GR) waterhemp was first discovered in Ontario, Canada, in 2014. In Ontario, GR waterhemp interference in previous studies reduced soybean yield up to 73%. Tank-mixes of herbicides with multiple modes-of-action are important for delaying the evolution of herbicide resistance. The objective of this study was to evaluate the efficacy of pyroxasulfone (150 g a.i. ha−1), S-metolachlor/metribuzin (1943 g a.i. ha−1), pyroxasulfone/sulfentrazone (300 g a.i. ha−1), and pyroxasulfone/flumioxazin (240 g a.i. ha−1) applied preemergence (PRE) with and without the addition of glyphosate/dicamba (1800 g a.e. ha−1) for the control of GR waterhemp in soybean. At 8 wk after treatment application (WAA), glyphosate/dicamba applied PRE controlled GR waterhemp 45%. Pyroxasulfone, S-metolachlor/metribuzin, pyroxasulfone/sulfentrazone, and pyroxasulfone/flumioxazin applied PRE controlled GR waterhemp 79%, 87%, 91%, and 95%, respectively. At 2, 4, 8, and 12 WAA, the addition of glyphosate/dicamba to the aforementioned PRE herbicides did not improve GR waterhemp control. There was no increase in GR waterhemp control with the addition glyphosate/dicamba; however, multiple herbicide modes-of-action should be utilized to reduce the selection intensity for herbicide-resistant weeds.

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Control of glyphosate-resistant common waterhemp (Amaranthus tuberculatus var rudis) with dicamba and dimethenamid-P in Ontario

Cited by 5 publications

References 6 publications

Is There a Benefit of Adding Atrazine to HPPD-Inhibiting Herbicides for Control of Multiple-Herbicide-Resistant, Including Group 5-Resistant, Waterhemp in Corn?

Is There a Benefit of Adding Atrazine to HPPD-Inhibiting Herbicides for Control of Multiple-Herbicide-Resistant, Including Group 5-Resistant, Waterhemp in Corn?

Early Postemergence Herbicide Tank-Mixtures for Control of Waterhemp Resistant to Four Herbicide Modes of Action in Corn

Control of glyphosate-resistant waterhemp with preemergence herbicides in glyphosate- and dicamba-resistant soybean

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