Concurrent with relatively mild Midwestern winters over the past few years, the Bean leaf beetle, Ceratoma trifurcata, has been more successful in surviving the overwintering portion of its life cycle (Bradshaw et al. 2003). As a result, the number of bean leaf beetles emerging in the spring has increased throughout the Upper Midwest, including Wisconsin (Grau et al. 2003), in recent years. Greater population densities of the overwintered population, and subsequent first generation, bean leaf beetles are of concern to soybean producers due to both direct and indirect damage potential. Bean leaf beetle feeding damage (defoliation) is direct damage. Thresholds have been established for bean leaf beetle defoliation. Refer to UWEX publication A3646, Pest Management in Wisconsin Field Crops, for specific defoliation threshold information (Boerboom et al. 2004). Indirect damage is linked to the role of bean leaf beetle as a vector of bean pod mottle virus (BPMV) (Giesler et al. 2002). Treatment thresholds for prevention of BPMV are not yet available.