Answer: Japanese Beetles can be controlled, or at least the population can be reduced, if you use rotonone, ryania, or neem. There's a botanical insecticide called 'Neem-Away' that's carried by Gardens Alive. It will control beetles without harming beneficial insects. Contact them at: 5100 Schenley Pl., Lawrenceburg, IN 47025, phone (812) 537-5108.
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