Abstract
Eight field trials were conducted from 2006 to 2008 at various locations in Ontario to evaluate the co-application of postemergence herbicides with cyhalothrin-lambda or dimethoate insecticides in cranberry and white bean. At 2 weeks after treatment, the addition of cyhalothrin-lambda or dimethoate insecticides to sethoxydim, quizalofop-p-ethyl, bentazon, fomesafen and bentazon plus fomesafen did not increase injury at the Exeter and Ridgetown locations except for bentazon plus dimethoate which caused greater injury than bentazon alone (2.9% vs 0.2%) in 2006. However at Harrow, the addition of dimethoate to quizalofop-p-ethyl increased injury (0% vs 4.9%) in 2007 and the addition cyhalothrin-lambda or dimethoate to sethoxydim increased injury in 2008 in dry bean. The addition of cyhalothrin-lambda to quizalofop-p-ethyl also increased injury (0% vs 4.5%) in 2008. There was no adverse effect on dry bean injury with other treatments at Harrow in 2007 or 2008. The addition of cyhalothrin-lambda or dimethoate to the herbicides evaluated did not have any adverse effect on plant height, shoot dry weight or yield of dry bean except for bentazon plus dimethoate which decreased shoot dry weight 20% compared to bentazon alone at Harrow in 2008. Based on these results, cyhalothrin-lambda or dimethoate can be tank-mixed with sethoxydim, quizalofop-p-ethyl, bentazon, fomesafen and bentazon plus fomesafen when the optimum application timing of these herbicides and insecticides coincide.
Highlights
Dry bean (Phaseolus vulgaris L.) is an important high value agricultural crop grown in Ontario
There were no visible incompatibility problems in respect to the spray solution or application with the various herbicide plus insecticide tankmixes evaluated in this study
At 1 weeks after treatment (WAT), the addition of dimethoate insecticide to bentazon or bentazon plus fomesafen resulted in increased visible injury in cranberry and white bean (Table 3)
Summary
Dry bean (Phaseolus vulgaris L.) is an important high value agricultural crop grown in Ontario. In 2010, dry bean growers planted nearly 57,000 hectares and produced 129,000 MT of dry bean with a farm gate value of approximately $100,000,000 [1]. Intensive agronomic practices, including effective integrated pest control management, are needed for profitable production of this important high value field crop. Growers often use postemergence (POST) herbicides such as sethoxydim, quizalofop-p-ethyl, bentazon, fomesafen and bentazon plus fomesafen for weed control in dry bean. Sethoxydim and quizalofop-p-ethyl inhibit acetyl-CoA carboxylase (ACCase), the enzyme needed for fatty acid synthesis and subsequent production of phospholipids needed for cell membranes in plants. Sethoxydim and quizalofop-p-ethyl can provide effective control of annual and perennial grass species such as Panicum dichotomiflorum Michx. Sethoxydim and quizalofop-p-ethyl can provide effective control of annual and perennial grass species such as Panicum dichotomiflorum Michx. (fall panicum), Echinochloa crusgalli L. (barnyard grass), Setaria viridis (L.) Beauv. (green foxtail), Digitaria sanguinalis (L.) Scop. (large crabgrass), Panicum miliaceum L. (proso millet), Panicum capillare L. (witchgrass) and Elytrigia repens (L.) Nevski (quackgrass) [2,3]
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