Japanese beetle development seems to be a bit ahead of schedule this year, which is not surprising with the warm temperatures this spring. Japanese beetle adults begin emergence when approximately 1,030 growing degree days have accumulated since January 1 and will continue emerging until 2,150 growing degree days have accumulated. Japanese beetle adults likely began emerging in the southern portion of Iowa recently, and emergence will likely occur late June or early July in northern Iowa. Entomologists in Missouri and Illinois have already confirmed emergence of Japanese beetle adults in their states.
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Article written by Ashley Dean and Erin Hodgson with contributions from the Integrated Crop Management News, and Iowa State University Extension and Outreach.
