Japanese Beetles! - Knowledgebase Question

Cottleville, Mi
Question by bubskey
March 24, 2010
When should I kill the Japanese Beetles' grubs that I know were laid in my backyard last year? Are the grubs ready to be killed in early Spring or should I wait until mid- or late Spring? I don't want to wait until all the beetles are hatched, flying around, and eating all my plants! Thanks!


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Answer from NGA
March 24, 2010

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A product such as Bayer Advanced Season Long Grub Control can be applied now or you can wait until July or August and apply a product such as Grubex. Follow label directions for timing and you should be okay.

Or, you can control Japanese beetle grubs by spraying beneficial nematodes on the lawn and garden area. These microscopic worm-like creatures attack only the grubs in the soil and not plants, animals or humans. Spray them in spring when the soil temperatures are above 55F and you should see a difference in summer. It's important to maintain soil moisture to keep the nematodes viable and so they can move easily through the soil. I suggest that you moisten soil well the day before you apply them, or wait until after it rains. Another product is milky spore powder, a naturally-occurring bacteria that kills grubs; you simply apply the powder in a grid pattern on your lawn. The powder is harmless to earthworms and other creatures. The bacteria will continue to multiply, and will keep working for up to 20 years. (The results won't be immediate, however; it will take some time to notice a decline in the grub population.) Hope this info helps!

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