Bean pod mottle virus causes qualitative and quantitative damage to soybeans, Glycine max, and is efficiently transmitted by the bean leaf beetle, Ceratoma trifurcata. During 2002 and 2003, five and six potential strategies, respectively, (seed treatment, early-season foliar insecticide, mid-season foliar insecticide, early- and mid-season foliar insecticide, seed treatment plus foliar insecticide, and a seed treatment plus and early-season foliar insecticide [2003]) for managing bean leaf beetles and bean pod mottle virus were evaluated. The current management strategy in Iowa recommends one early and one mid-season Warrior (lambda-cyhalothrin) (2.5 fl. oz./arce [29.9 ml/hectare]) application. This study determined the relative efficacy of applying a systemic seed treatment, Cruiser (thiamethoxam) alone or in combination with timed foliar applications of Warrior. Seven treatments were used: Cruiser, Warrior (late May), Warrior (early July), Cruiser plus Warrior (late May), Cruiser plus Warrior (early July), Warrior twice (late May and early June), and an untreated control. The effectiveness of these treatments was measured by comparing beetle populations, percent of virus incidence in soybeans, plant height, seed weight. Our data indicate that systemic seed treatments may provide greater protection from Bean pod mottle virus than an early-season foliar insecticide.
Species 1: Coleoptera Chrysomelidae Cerotoma trifurcata (bean leaf beetle)
Keywords: bean pod mottle virus, soybean
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