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NC Iowa | Here is what Wikipedia says. I have no experience with them.
https://en.m.wikipedia.org/wiki/Japanese_beetle
[14] Additionally, when present in small numbers, the beetles may be manually controlled using a soap-water spray mixture, shaking a plant in the morning hours and disposing of the fallen beetles,[12] or simply picking them off attractions such as rose flowers, since the presence of beetles attracts more beetles to that plant.[14]
Several insect predators and parasitoids have been introduced to the United States for biocontrol. Two of them, Istocheta aldrichi and Tiphia vernalis, are well established with significant rates of parasitism. | |
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Japanese beetles
