A total of six experiments were conducted over a two-year period (2018,\n2019) at the University of Guelph Ridgetown Campus to assess the efficacy of\nvarious herbicides applied postemergence (POST) for the control of common\nchickweed in winter wheat. Fluroxypyr/bromoxynil/MCPA,\npyrasulfotole/bromoxynil, pyrasulfotole/bromoxynil/fluroxypyr,\npyrasulfotole/bromoxynil/thiencarbazone,\npyrasulfotole/bromoxynil/thiencarbazone + MCPA ester, tolpyralate and fluroxypyr/\nhalauxifen + MCPA EHE, applied POST, controlled common\nchickweed only 5% - 42% at 2 weeks after treatment (WAT) and 1% - 23% at\n4 WAT and resulted in common chickweed density and biomass that was\nsimilar to non-treated weedy control. Fluroxypyr/halauxifen + pyroxsulam +\nMCPA EHE, applied POST, provided 57% - 82% control of common chickweed\nand reduced density 93% and biomass 98% compared to the non-treated\ncontrol. Thifensulfuron/tribenuron, thifensulfuron/tribenuron + MCPA ester,\nthifensulfuron/tribenuron + fluroxypyr + MCPA ester, tribenuron +\nthiencarbazone, and tribenuron + thiencarbazone + MCPA ester, applied\nPOST, controlled common chickweed 98% - 100% and reduced common\nchickweed density 96% - 98% and common chickweed biomass 99%. Based\non these results, herbicide treatments which contained tribenuron including\nthifensulfuron/tribenuron, thifensulfuron/tribenuron + MCPA ester, thifensulfuron/\ntribenuron + fluroxypyr + MCPA ester, tribenuron + thiencarbazone,\nand tribenuron + thiencarbazone + MCPA ester were the most efficacious\nfor the control of common chickweed in wheat. In addition, fluroxypyr/\nhalauxifen + pyroxsulam + MCPA EHE, applied POST, can provide\nadequate control of common chickweed in winter wheat.
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