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What are those white spots on the back of the head of the Japanese beetle adults?

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What are those white spots on the back of the head of the Japanese beetle adults?

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Many of the early-emerging Japanese beetle adults have had eggs of the “winsome fly” attached to the thorax. In one site a little north of Rochester, New Hampshire, USA; about 30% of the beetles appear to be parasitized. If you see beetles with small white specks on the thorax or back of the head, let those beetles go. The parasitoid will kill the beetle quite quickly, and the attacking larva needs the cadaver to survive until next spring.

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