The bean leaf beetle overwinters as an adult that feeds on young soybeans in May and June. They lay eggs that produce the first generation, which attacks beans in July. The subsequent generation, the second, is of most concern when protecting the plant from the beetles feeding because it attacks the pods and beans as well as foliage.
Iowa State University
Tollefson, Jon J. and Rice, Marlin E., "Here Come the Bean Leaf Beetles!" (2008). Integrated Crop Management News. 796.
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