Bean pod mottle virus (BPMV) is an uprising disease problem in soybeans (Glycine max) in the North Central Region. There are several affects of viral infection including yield loss and poor seed quality. The primary vector of BPMV in the North Central Region is Cerotoma trifurcata (Förster) (bean leaf beetle). The purpose of this study was to determine the effects of controlling emerging overwintering BLB populations on BPMV incidence. In 2001, four insecticide treatments were replicated four times to control BLB populations. Insecticide treatments were three seed applied products (imidacloprid and thiamethoxam) and one foliar applied product (cyalothrin). BLB counts were performed just prior to foliar insecticide application (Stage VC), 2,5,11, and 15 days post-application. Leaf samples were collected throughout growing season to measure BPMV incidence. There was a significant difference (P>0.05) in BLB populations between treated plots and untreated plots up to 11 days post-application. Higher rates of imidacloprid and thiamethoxam had significantly lower BLB populations 15 day post-application. By growth stage R3, the non-treated plots had 93% BPMV infection, seed applied plots had between 50-56% infection, and the foliar applied plots had 0% infection. At growth stage R6, the incidence of BPMV in the treated plot drastically increased due to F2 beetles emergence and feeding. The use of insecticides did significantly reduce the number of BLB per meter of row and reduced BPMV infection in the plots. It appears that by controlling BLB populations, the incidence level of BPMV can also be managed.
Species 1: Coleoptera Chrysomelidae Cerotoma trifurcata (Bean Leaf Beetle)
Keywords: Virus Managment, BPMV
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