The Q&A Archives: Japanese Beetles

Question: Is there any plant that will discourage Japanese Beetles?

Answer: There are a few trap crops and some plants that will actually poison the beetles. According to 'The Healthy Garden Handbook', published by Simon & Schuster, 1230 Avenue of the Americas, New York, NY 10020, ISBN# 0-671-65788-7, the leaves of castor beans and the flowers of white geraniums, red buckeyes and four-o'clocks are poisonous to Japanese beetles. Trap crops include borage, African marigolds, evening primrose, soybeans, knotweed, whtie roses, white zinnias, and wild blackberries will attract Japanese beetles away from your vegetable crops. Be sure to cultivate the soil frequently in the spring and fall to expose the grubs to weather and to predators.

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