Postemergence herbicides for control of glyphosate-resistant Canada fleabane in corn

Mahoney, Kris J.; Shropshire, Christy; Sikkema, Peter H.

doi:10.1139/cjps-2016-0221

Cited by 7 publications

(20 citation statements)

References 8 publications

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“…E. Walker], a weed species closely related to horseweed, utilizing several rates of the mix halauxifen-methyl+diclosulam resulted in 80% to 100% control 45 DAT depending on rate and weed height. Other researchers have shown similar results for GR horseweed control with preplant burndown applications of 2,4-D and dicamba (Brown et al 2016; Byker et al 2013; Kruger et al 2010a; Mahoney et al 2017; Mithila et al 2011; Montgomery et al 2017).…”

Section: Resultsmentioning

confidence: 57%

Weed Control with Halauxifen-Methyl Applied Alone and in Mixtures with 2,4-D, Dicamba, and Glyphosate

2018

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Synthetic auxin herbicides such as 2,4-D and dicamba are often utilized to control broadleaf weeds in preplant burndown applications to soybean. Halauxifen-methyl is a new synthetic auxin herbicide for broadleaf weed control in preplant burndown applications to corn, cotton, and soybean at low use rates (5 g ae ha–1). Field experiments were conducted to evaluate efficacy and weed control spectrum of halauxifen-methyl applied alone and in mixtures with 2,4-D (560 g ae ha–1), dicamba (280 g ae ha–1), and glyphosate (560 g ae ha–1). Glyphosate-resistant (GR) horseweed was controlled with halauxifen-methyl applied alone (90% control) and in mixtures (87% to 97% control) 35 d after treatment (DAT). Common ragweed was controlled 93% with halauxifen-methyl applied alone and 91% to 97% in mixtures 35 DAT. Halauxifen-methyl applied alone resulted in poor giant ragweed control 21 DAT (73% control); however, mixtures of halauxifen-methyl with 2,4-D, dicamba, or glyphosate controlled giant ragweed (86% to 98% control). Halauxifen-methyl alone resulted in poor redroot pigweed control (62% control) 21 DAT; however, mixtures of halauxifen-methyl with dicamba, 2,4-D, or glyphosate controlled redroot pigweed (89% to 98% control). Halauxifen-methyl controls GR horseweed and common ragweed applied alone and in mixtures with other synthetic auxin herbicides and glyphosate. Furthermore, mixing 2,4-D or dicamba with halauxifen-methyl can increase the weed control spectrum in preplant burndown applications.

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Section: Resultsmentioning

confidence: 57%

Weed Control with Halauxifen-Methyl Applied Alone and in Mixtures with 2,4-D, Dicamba, and Glyphosate

2018

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“…Other researchers have shown similar results for horseweed control with preplant burndown applications of 2,4-D, dicamba, glyphosate, glufosinate, and saflufenacil (Brown et al 2016;Byker et al 2013;Davis et al 2010;Eubank et al 2008;Kruger et al 2010;Mahoney et al 2017;Mellendorf et al 2013;Mithila et al 2011;Montgomery et al 2017;Owen et al 2009;Shrestha et al 2007;Steckel et al 2006;VanGessel et al 2009). Orthogonal contrasts were used to further compare herbicide treatments ( Table 5) and showed that adding glyphosate, 2,4-D, or dicamba to halauxifen-methyl did not significantly increase GR horseweed control compared to halauxifen-methyl alone.…”

Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 67%

“…In general, spring burndown applications of these herbicides in Indiana occur from early April to early May, depending on appropriate weather conditions for entering the field. However, research has shown that herbicides such as 2,4-D, glufosinate, and paraquat can result in variable GR horseweed control in the spring depending on environmental conditions and horseweed size at the time of application (Brown et al 2016; Byker et al 2013; Davis et al 2010; Kruger et al 2008, Kruger et al 2010; Loux et al 2006; Loux and Johnson 2014; Mahoney et al 2017; Mellendorf et al 2013; Montgomery et al 2017). Research has also shown that saflufenacil and dicamba are effective herbicides for GR horseweed control in burndown applications (Brown et al 2016; Byker et al 2013; Kruger et al 2008; Mellendorf et al 2013; Montgomery et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Herbicide Programs Utilizing Halauxifen-Methyl for Glyphosate-Resistant Horseweed (Conyza canadensis) Control in Soybean

2018

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Evolution of glyphosate-resistant (GR) weeds, such as horseweed, presents major challenges in no-till soybean production systems. Effective GR horseweed control with preplant burndown applications is necessary to prevent potential soybean yield losses due to competition and to manage the soil weed seedbank. Halauxifen-methyl is a new synthetic auxin herbicide for broadleaf weed control in preplant burndown applications for soybean and other crops at low use rates (5 g ae ha–1). Experiments were conducted to evaluate the efficacy of herbicide treatments containing halauxifen-methyl for control of GR horseweed in comparison to existing herbicide treatments utilized in no-till GR soybean systems. Glyphosate alone controlled horseweed 33%. Herbicide treatments that included halauxifen-methyl, dicamba, or saflufenacil in combination with glyphosate controlled horseweed 87% to 96%, 89%, and 93%, respectively, 35 d after burndown application (DAB). Horseweed control, horseweed density reduction, and ground cover reduction by halauxifen-methyl plus glyphosate was similar to dicamba plus glyphosate. Horseweed control was greater for halauxifen-methyl plus glyphosate than for 2,4-D plus glyphosate. Cloransulam, cloransulam plus flumioxazin, and cloransulam plus sulfentrazone added to halauxifen-methyl plus glyphosate increased horseweed control and reduced horseweed density. No herbicide injury or soybean yield reduction was observed for treatments containing halauxifen-methyl.

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“…A common management strategy implemented by growers for control of GR horseweed is the use of herbicides with alternative modes of action (Scott and VanGessel 2007). In Ontario, several soil-applied residual herbicides controlled GR horseweed >90% in corn (Brown et al 2016;Ford et al 2014); however, POST applied herbicide options for control of multiple-resistant (MR) biotypes in corn are limited (Mahoney et al 2017). In Ontario studies, only dicamba, dicamba:diflufenzopyr, dicamba:atrazine, and bromoxynil þ atrazine applied POST provided >90% control of this species in corn, representing just four herbicide sites of action (Mahoney et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Multiple herbicide-resistant horseweed (Conyza canadensis) dose response to tolpyralate and tolpyralate plus atrazine and comparison to industry standard herbicides in corn

Metzger

Soltani

Raeder³

et al. 2019

Weed Technol

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Horseweed biotypes resistant to glyphosate and ALS-inhibiting herbicides are becoming more prevalent in Canada and the United States and present a significant management challenge in field crops. Tolpyralate is a recently commercialized herbicide for use in corn that inhibits 4-hydroxyphenylpyruvate dioxygenase (HPPD), and there is little information regarding its efficacy on horseweed. Six field experiments were conducted in 2017 and 2018 at four locations in Ontario, Canada, to determine the biologically effective dose of tolpyralate and tolpyralate + atrazine and to compare label rates of tolpyralate and tolpyralate + atrazine to currently accepted herbicide standards for POST control of glyphosate and cloransulam-methyl resistant (MR) horseweed. At 8 wk after application (WAA), tolpyralate at 4.8 and 22.6 g ha–1 provided 50% and 80% control, respectively. When applied with atrazine at a 1:33.3 tank-mix ratio, 22.3 + 741.7 g ha–1 provided 95% control of MR horseweed. The addition of atrazine to tolpyralate at label rates improved control of MR horseweed to 98%, which was similar to the control provided by dicamba:atrazine and bromoxynil + atrazine. The results of this study indicate that tolpyralate + atrazine provides excellent control of MR horseweed POST in corn.

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Postemergence herbicides for control of glyphosate-resistant Canada fleabane in corn

Cited by 7 publications

References 8 publications

Weed Control with Halauxifen-Methyl Applied Alone and in Mixtures with 2,4-D, Dicamba, and Glyphosate

Weed Control with Halauxifen-Methyl Applied Alone and in Mixtures with 2,4-D, Dicamba, and Glyphosate

Herbicide Programs Utilizing Halauxifen-Methyl for Glyphosate-Resistant Horseweed (Conyza canadensis) Control in Soybean

Multiple herbicide-resistant horseweed (Conyza canadensis) dose response to tolpyralate and tolpyralate plus atrazine and comparison to industry standard herbicides in corn

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