Sensitivity of Adzuki Bean (<i>Vigna angularis</i>) to Acifluorfen, Fomesafen, Bentazon, Imazethapyr and Halosulfuron-Methyl Applied Postemergence
- 1 University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
- 2 University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
- 3 University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
Abstract
New herbicide options are needed for postemergence (POST) broadleaf weed control in adzuki bean . A field study, of five experiments, was conducted over a three-year period (2014, 2015, 2016) in Ontario to evaluate the tolerance of adzuki bean to the POST application of acifluorfen (600 and 1200 g · ai · ha - 1 ), fomesafen (240 and 480 g·ai·ha - 1 ), bentazon (1080 and 2160 g·ai·ha - 1 ), ima zethapyr (100 and 200 g · ai · ha - 1 ) and halosulfuron-methyl (75 and 150 g · ai · ha - 1 ). Acifluorfen and fomesafen applied POST caused as much as 12% visible injury at the 1X rate and 20% visible injury at the 2X rate but had no adverse effect on adzuki bean population, shoot dry weight, height, maturity or yield. Bentazon caused as much as 23% visible injury at 1080 g · ai · ha - 1 and 28% visible injury at 2160 g · ai · ha - 1 but caused no adverse effect on adzuki bean population, shoot dry weight, height, maturity or yield at either rate, except at 2160 g · ai · ha - 1 which reduced shoot dry weight 20% and height 12%. Imazethapyr caused as much as 22% visible injury at 100 g · ai · ha - 1 and 34% visible injury at 200 g · ai · ha - 1 but caused no adverse effect on adzuki bean population, shoot dry weight, height, maturity or yield at either rate except at 200 g · ai · ha - 1 which delayed maturity slightly. Halosulfuron-methyl caused as much as 65% visible injury and reduced shoot dry weight, height and yield 64%, 41%, and 28%, respectively. This research concludes that acfluorfen, fomesafen, bentazon, imazethapyr and halosulfuron at the rates evaluated can cause the significant injury in adzuki bean.
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