Bean leaf beetles active through mid-June
It is now evident that sufficient numbers of bean leaf beetles survived the winter to cause problems in some early-emerging soybean fields. The next question is how much longer will they be around to feed on the soybean? Rick Smelser and Larry Pedigo, entomologists at Iowa State University, surveyed the bean leaf beetle for 3 years during the late 1980s. What they found was that in 1986 beetles colonized soybean on May 15-17, peaked in late May, and were present until numbers fell to zero in late June.