Bean pod mottle virus (BPMV) is a soybean pathogen transmitted by the bean leaf beetle, Cerotoma trifurcata (Forster). Recently, BPMV has become prevalent in most Iowa counties and has also been detected in other midwestern states. Bean pod mottle virus is a major concern for soybean producers because it can reduce yield and cause soybean discoloration, which decreases value. To test a management strategy for BPMV, three insecticide treatments and an unsprayed control were applied at field locations in northwest and central Iowa during summer 2000 and 2001. Each treatment area was 36.58 m (120 ft.) by at least 152.4 m (500 ft.) and each treatment was replicated four times in a randomized complete block design. Lambda-cyhalothrin was used for all insecticide applications. The treatments were: 1) one insecticide spray with 182.75 ml/ha (2.5 oz./acre) insecticide at soybean stage VC-V1, 2) one insecticide spray with 182.75 ml/ha insecticide at soybean stage VC-V1 and another insecticide spray with 182.75 ml/ha insecticide approximately 10 days later, 3) one insecticide spray with 182.75 ml/ha insecticide at soybean stage VC-V1, and one insecticide spray with 233.94 ml/ha (3.2 oz./acre) insecticide in mid-July when the first teneral first-generation bean leaf beetles were detected in the field. In 2000, at the northwest Iowa location, yield was greater in each of the treated plots compared with the unsprayed control. At the central Iowa location, there were no significant differences in yield. At both locations, soybeans from the plots sprayed once early in the season and once in mid-July had significantly less discoloration than the unsprayed control. Yield and seed discoloration data will be evaluated in 2001 and presented as well as data on beetle populations, BPMV incidence, and seed germination from both years of the experiment.
Species 1: Coleoptera Chrysomelidae Cerotoma trifurcata (bean leaf beetle)
Keywords: soybean, bean pod mottle virus
The ESA 2001 Annual Meeting - 2001: An Entomological Odyssey of ESA