Some locations in Iowa have many bean leaf beetles this year. After a large population of overwintering beetles, the first generation beetles are now emerging, with as many as 147 beetles in 20 sweeps from a field in Ames. Without careful attention, these beetles can be confused with other economically important beetles found in soybean. A few spotted beetles currently can be found in soybean, such as the twelvespotted lady beetle, Coleomegilla maculata; the multicolored Asian lady beetle, Harmonia axyridis; and spotted cucumber beetle, Diabrotica undecimpunctata.
Iowa State University
Bradshaw, Jeffrey D. and Rice, Marlin E., "Bean leaf beetle identification" (2002). Integrated Crop Management News. 1711.
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