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), imazethapyr (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.
Highlights
Adzuki bean [Vigna angularis (Willd.) Ohwi & Ohashi] is a niche market class of bean that is popular with growers in south-western Ontario [1] [2]
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%
This research concludes that acfluorfen, fomesafen, bentazon, imazethapyr and halosulfuron at the rates evaluated can cause the significant injury in adzuki bean
Summary
Adzuki bean [Vigna angularis (Willd.) Ohwi & Ohashi] is a niche market class of bean that is popular with growers in south-western Ontario [1] [2]. Most of the adzuki bean produced in Ontario is exported to Asia, in particular to Japan, where demand has been increasing steadily over the last few years [1] [2]. Adzuki beans have slow early growth and do not compete well with weeds which can cause substantial seed yield losses if not adequately controlled [4]. Few herbicide options are available for weed management in adzuki bean. New herbicide options must be found for the control of broadleaf weeds in adzuki bean
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have