Bean leaf beetles are still extremely abundant in some fields and are continuing to cause damage to pods. I swept one field south of Ames on September 8 that was just beginning to turn yellow. In 10 sweeps I collected 229 bean leaf beetles, or as best as I could count! In an adjacent variety where approximately half of the leaves were yellow, I collected 82 beetles in 10 sweeps. It was not uncommon for 60-70 percent of the pods on the upper half of the plants to be heavily scarred or flat with no developing seeds.
Iowa State University
Rice, Marlin E., "Bean leaf beetles still abundant in late 2000" (2000). Integrated Crop Management News. 2011.
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