I've had a heavy year of Japanese Beetles, too. I think they overwintered in my compost pile. Every day in July they would fly out of the compost pile. They haven't eaten my tomatoes or peppers...they left them for the grasshoppers and horn worms. They preferred the peaches. I had so many peaches I didn't mind letting them have some, but I'm afraid it might encourage them to return. They didn't bother my Concord grapes. I hit them with a flat shovel and they are so armored that they still would fly away.
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