The Q&A Archives: Beetles

Question: How do I keep beetles from destroying my flowering plants?

Answer: The most common flower eating beetle in your area is Japanese Beetle. It's easier to control the grubs in the soil than to control the adults, but here are a few options. The adults can be controlled by spraying susceptible plants with insecticides. Over-the-counter pesticides available for this include: acephate (Orthene), carbaryl (Sevin), and several pyrethroids - bifenthrin, cyfluthrin, deltamethrin, lambda-cyhalothrin, permethrin, and others. Applications of imidacloprid (=Bayer Advanced Tree & Shrub Concentrate) generally need to be made 20 days before anticipated Japanese beetle adult activity. During the heavy adult activity periods, sprays may be needed every 5 to 10 days.

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