Controlling Japanese beetles



If you had the plague of Japanese beetles last year, you are probably experiencing a new emergence. It is important to protect your plants from early feedings right now to avoid the cosmetic damage they wreak. Traditional insecticide preparations (glue traps) actually increase the number of beetles. Cheese cloth wraps prevents pollinators from reaching the flowers.

There are numerous problems using “safe” preparations for control. Bacillus thuringiensis affects caterpillars and butterflies. Neem oil and pyola are very short-lived and need constant reapplications. Permethrin and Sevin need night-time applications to ensure drying before the bees emerge in the daylight.

If the Japanese beetle problem seems overwhelming, it is time to contact a professional licensed applicator.

Jo Bjerke is a master gardener. She lives in Virginia, MN.

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