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Japanese bettles #805918

Asked August 12, 2022, 9:59 AM EDT

How can I effectively manage infestation of beetles on my green beans,roses, and apple trees?

Chisago County Minnesota

Expert Response

Thank you for writing.
Japanese beetles are tough. https://extension.umn.edu/yard-and-garden-insects/japanese-beetles
1. Do not use traps--they will draw beetles to your property.
2. Make your lawn less welcoming to the grubs to mature in.  There is a product called milky spore, available at large garden stores, that gives the larva a fatal disease.  It is easy to apply and non-toxic.  https://extension.entm.purdue.edu/publications/E-271/E-271.html
3. Allow your lawn to grow to 5.5 and cut to 4 inches.  The thicker lawn with deeper roots will be more drought resistant and more resistant to grubs.
4. There is a disease now infecting japanese beetles. https://www.facebook.com/MnArboretum/posts/finally-we-have-some-good-news-about-japanese-beetles-a-natural-predator-of-the-/10159495368021284/ 
where you can, swat them into a bucket with a small amount of detergent.  The detergent destroys the water tension so that they cannot fly out.
These pests are cyclical. Sit tight.
All pesticide chemicals that kill these beetles are also hard on pollinators.
Steve Miles Replied August 12, 2022, 11:04 AM EDT

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