Japanese beetles have only one generation per year. But these beetles emerge over a long period from late June through August and they live for over 30 days.

Japanese beetles feed on the foliage and fruit of various fruit crops grown in Michigan, causing damage to the plant and increasing the risk of fungal diseases.

Their emergence during mid-summer can also result in their presence during harvest of some fruit crops, creating a risk of contamination. They are also highly mobile insects and can fly into fields from surrounding areas.

This article provides information on insecticide options based on tests over the past few years conducted at the Trevor Nichols Research Complex and at grower’s farms.