Japanese Beetle

Degree-day models for Japanese beetle are used to predict emergence of adults in late spring and early summer. These maps use a simple degree-day calculation with a lower developmental threshold of 59°F and upper threshold of 71°F with a January 1 biofix date based on adult trap catch data from Drs. Dominique Ebbenga and Bill Hutchison near the Rosemount Research and Outreach Center and Forest Lake, MN.

Current degree-days

Forecast degree-days

The Minn. Extension IPM Program is a collaboration of University of Minnesota Extension & the College of Food, Agriculture, and Natural Resource Sciences (CFANS).