how to get rid of Japanese beetles on plants: fill a pint-size spray bottle with warm water, about 3 tsp of garlic powder, 2 tsp of cayenne pepper, a couple of squirts of dish soap and a little under a 1/4 cup of vegetable oil. Spray on bushes.
Eliminate Japanese Beetle Grubs for 10 Years or More! Milky Spore is a naturally occurring microscopic bacteria (Bacillus popilliae) that kills Japanese beetle grubs before they can grow into ravenous adults. It's a long-term solution because it survives winter temperatures. The Milky Spore population increases each year, reaching peak effectiveness about three years after application, and lasts ten years or more. Safe for people, pets and beneficial soil organisms
10 tips for getting rid of Japanese Beetles How to get rid of Japanese beetles naturally. Just plant some plants that repel them: catnip, rue, larkspur, cloves, garlic, tansy, and geranium. These natural ways to rid your outdoor plants of Japanese beetles and prevent Japanese beetle damage and prevent additional damage have been used successfully for years by farmers.