Control of Glyphosate-Resistant Horseweed in Winter Wheat with Pyrasulfotole Premixed with Bromoxynil

Mahoney, Kris J.; McNaughton, Kristen E.; Sikkema, Peter H.

doi:10.1614/wt-d-15-00046.1

Cited by 9 publications

(19 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Across all glyphosate tank mixtures, bromoxynil + atrazine was the best option as control at 4 and 8 WAT, population density, and aboveground biomass were similar to the weed-free control. This result was consistent with a recent study in winter wheat where a POST tank mixture containing bromoxynil controlled GR Canada fleabane (Mahoney et al 2016).…”

Section: Resultssupporting

confidence: 93%

See 1 more Smart Citation

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

Mahoney¹,

Shropshire²,

Sikkema³

2016

Can. J. Plant Sci.

View full text Add to dashboard Cite

Post-emergence herbicides were evaluated for glyphosate-resistant Canada fleabane control in corn (Zea mays L.) from 2013 to 2015. By 8 wk after treatment, dicamba/atrazine (96% control), dicamba (95% control), bromoxynil + atrazine (93% control), dicamba/diflufenzopyr (90% control), and tembotrione/thiencarbazonemethyl + dicamba (85% control) reduced population density and aboveground biomass to levels equivalent to the weed-free control.

show abstract

Section: Resultssupporting

confidence: 93%

“…As a result, GR Canada fleabane must now be controlled in the major field crops of southern Ontario: corn (Zea mays L.), soybean [Glycine max (L.) Merr. ], and winter wheat (Triticum aestivum L.) (Byker et al 2013a;Ford et al 2014;Mahoney et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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

Mahoney¹,

Shropshire²,

Sikkema³

2016

Can. J. Plant Sci.

View full text Add to dashboard Cite

show abstract

“…Lack of adequate control was often a result of regrowth observed after application. Mahoney et al (2016) observed somewhat greater control (89%) when 2,4-D was applied at 528 g ai ha −1 to 3-to 5-cm tall glyphosateresistant horseweed 8 wk after application.…”

Section: Weed Technologymentioning

confidence: 84%

“…Still effective, widely used, and one of the oldest synthetic herbicides available, 2,4-D is used for broadleaf weed control on approximately 20% of wheat grown in the southern Great Plains region (USDA-NASS 2018). Similar to 2,4-D, 2-methyl-4-chlorophenoxyacetic acid (MCPA) can be an effective option for horseweed control in wheat; however, control with MCPA alone on horseweed is often less compared with 2,4-D alone or when mixed with another herbicide (Kruger et al 2010;Mahoney et al 2016). Similar to 2,4-D, other common synthetic auxins used for horseweed management in wheat include dicamba and fluroxypyr.…”

Section: Introductionmentioning

confidence: 99%

Horseweed (Conyza canadensis) management in Oklahoma winter wheat

2019

View full text Add to dashboard Cite

Halauxifen plus florasulam, thifensulfuron plus fluroxypyr, and bromoxynil plus bicyclopyrone are three, relatively new POST premix herbicides developed for control of broadleaf weeds in winter wheat. These herbicides, along with older products, were evaluated for their control of horseweed in Altus, Perkins, and Ponca City, Oklahoma, during the spring of 2017 and 2018. Horseweed has become a critical weed in Oklahoma because of its extensive germination window, changes in tillage practices, and increase in herbicide-resistant horseweed biotypes. Visual weed control was estimated every 2 wk throughout the growing season and wheat yield was collected from three of the six site-years. Horseweed size ranged from 5 to 20 cm at time of application. The halauxifen plus florasulam, and thifensulfuron plus fluroxypyr combinations were effective at controlling a wide range of horseweed rosette sizes across all locations, whereas control with other treatments varied depending on presence of herbicide resistance, weed size at time of application, and mix partner.

show abstract

“…Mahoney et al (2016) reported that MCPA (630 g ai ha -1 ), 2,4-D (528 g ai ha -1 ), fluroxypyr þ MCPA (108 þ 560 g ai ha -1 ), clopyralid (200 g ai ha -1 ), and pyrasulfotole þ bromoxynil (31.1 þ 174.3 g ai ha -1 ) controlled GR horseweed 58%, 78%, 82%, 86%, and 95% in winter wheat 4 WAA, respectively. At 8 WAA, Mahoney et al (2016) reported that MCPA, clopyralid, 2,4-D, fluroxypyr þ MCPA, and pyrasulfotole/ bromoxynil provided 67%, 87%, 89%, 96%, and 97% control of GR horseweed in winter wheat, respectively. In this study, the lower GR horseweed control with MCPA can be attributed to the lower use rate, whereas the improved control with 2,4-D can be attributed to the higher use rate.…”

Section: Gr Horseweedmentioning

confidence: 99%

Halauxifen-methyl controls glyphosate-resistant horseweed (Conyza canadensis) but not giant ragweed (Ambrosia trifida) in winter wheat

et al. 2020

Self Cite

View full text Add to dashboard Cite

Horseweed is a competitive summer or winter annual weed that produces up to 230,000 small seeds per plant that are capable of traveling more than 500 km via wind. Giant ragweed is a tall, highly competitive summer annual weed. Glyphosate-resistant (GR) horseweed and GR giant ragweed pose significant challenges for producers in the United States and Ontario, Canada. It is thought that an integrated weed management (IWM) system involving herbicide rotation is required to control GR biotypes. Halauxifen-methyl is a new selective broadleaf POST herbicide registered for use in cereal crops; there is limited information on its efficacy on horseweed and giant ragweed. The purpose of this research was to determine the efficacy of halauxifen-methyl applied POST, alone and in a tank mix, for the control of GR horseweed and GR giant ragweed in wheat across southwestern Ontario. For each weed species, an efficacy study consisting of six field experiments was conducted over a 2-yr period (2018, 2019). At 8 wk after application (WAA), halauxifen-methyl, fluroxypyr/halauxifen-methyl, fluroxypyr/halauxifen-methyl + MCPA EHE, fluroxypyr + MCPA ester, 2,4-D ester, clopyralid, and pyrasulfotole/bromoxynil + ammonium sulfate controlled GR horseweed >95%. Fluroxypyr and MCPA provided only 86% and 37% control of GR horseweed, respectively. At 8 WAA, fluroxypyr, fluroxypyr/halauxifen-methyl, fluroxypyr/halauxifen-methyl + MCPA EHE, fluroxypyr + MCPA ester, fluroxypyr/halauxifen-methyl + MCPA EHE + pyroxsulam, 2,4-D ester, clopyralid, and thifensulfuron/tribenuron + fluroxypyr + MCPA ester controlled GR giant ragweed 87%, 88%, 90%, 94%, 96%, 96%, 98%, and 93%, respectively. Halauxifen-methyl and pyroxsulam provided only 45% and 28% control of GR giant ragweed, respectively. Halauxifen-methyl applied alone POST in the spring controlled GR horseweed but not GR giant ragweed in winter wheat.

show abstract

Control of Glyphosate-Resistant Horseweed in Winter Wheat with Pyrasulfotole Premixed with Bromoxynil

Cited by 9 publications

References 29 publications

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

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

Horseweed (Conyza canadensis) management in Oklahoma winter wheat

Halauxifen-methyl controls glyphosate-resistant horseweed (Conyza canadensis) but not giant ragweed (Ambrosia trifida) in winter wheat

Contact Info

Product

Resources

About