As I mentioned in last week's newsletter, grape colaspis has caused some early season stand reduction in cornfields in eastern Iowa. On July 19, I was in Harrison County (western Iowa) and in seven first-year cornfields I found adult colaspis beetles (these beetles may not be grape colaspis). They seemed to be most abundant on the green silks, whereas a few were hidden in the leaf axils. One field southwest of Magnolia averaged at least one beetle per plant.
Iowa State University
Rice, Marlin E., "Colaspis beetles in western Iowa corn" (2003). Integrated Crop Management News. 1658.
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