Answer: Japanese beetles are prevalent during the summer months and are very difficult to control because they fly long distances. You can handpick them in the evening or morning when they are slower moving (drop them into soapy water), you can try to repel them using a spray containing neem, and you can use carbaryl (the active ingredient in Sevin for example) to kill them -- however this is a contact insecticide with no residual action so it will kill only those touched by the spray. You can also try to kill them in the grub stage using beneficial nematodes or milky spore disease on the lawn or to treat the soil in your planting beds. The traps are not usually helpful as they will attract at least as many beetles as they catch. Unfortunately, there is no easy answer.
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