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Put Arboretum knowledge to work

Japanese Beetles: What Can You Do?

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Unfortunately, Japanese Beetles have no natural predatorsĀ in the United States, and they are spreading rapidly westward. An abundance of favorable food plants and the ability to fly up to 5 miles makes controlling Japanese Beetles a problem.

Japanese Beetles and Japanese Beetle grubs cause damage to foliage, shrubbery, trees lawn and turf. Any rose lover knows wht they can do – in just a couple of days! Complete defoliation of plants is possible and very quick if steps are not taken to control the problem early on. The death of lawn and turf grasses happens slowly but steadily as Japanese Beetle grub populations increase over a few years’ time.

Fortunately, getting rid of Japanese Beetles isn’t impossible. Because of their destructiveness, a great deal of research has gone into developing strategies for controlling the Japanese Beetle individually and as a community. Please click here to get more information.

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11 Responses to “Japanese Beetles: What Can You Do?”
  1. Barbara Scott Says:

    You didn’t mention Milky Spore. What do you think about its effectiveness?

  2. Carol Bennema Says:

    Thank you SO much for this information.
    They hit my yard in Downers Grove last week.
    CB

  3. Cliff Hill Says:

    Where can one purchase Neem oil products?
    Thanks!

  4. kjaros Says:

    Neem oil products should be available at your local hardware store or garden center. You can also order through online outlets.

  5. kjaros Says:

    Milky Spore is a bacterium, Bacillus popillae, which is lethal primarily for Japanese beetle grubs. Once applied, it can remain in the soil for many years. In warm climates, good control of the Japanese beetle can occur in one to three years; in cooler climates, three to five years. It is considered an organic treatment for Japanese Beetle grubs.

    I was able to find a number of outlets online for the product. You should also check with your local garden center.

  6. plantmgr Says:

    I use dishwashing liquid and water in a plastic disposable cup. I use about two squirts of the soap and fill the cup about 2/3 full. I enjoy tapping the bugs so they fall in the cup. It’s cathartic!

  7. marnee Says:

    Milky spore treatment is only effective if all of your neighbors use it as a lawn treatment too, since Japanese Beetles will fly into your yard to eat your tasty roses from your neighbors yards.

  8. Patricia Ebelt Says:

    Where do Japanese Beetles go at night or when it rains?

  9. m, kaspar Says:

    does diatomaceous earth work on Japanese beetles?

  10. Terry Vitacco Says:

    How much tap water per tablespoon of castor oil soap? Spray
    bottles come in several different sizes.

  11. Plant Clinic Says:

    Milky spore disease is not considered to be as effective in our colder climate as it is farther south. If we have a cold winter, it sometimes does not survive. A better organic alternative to kill all grubs, not just Japanese beetle grubs, is to use beneficial nematodes which are microscopic roundworms which seek out the grubs and kill them.

    People who spray dish soap on their plants may damage their plants. Dish soap was meant to wash dishes and sometimes kills leaves. If you insist on spraying dish soap on your leaves, first test the soap for safety by spraying the soap on a leaf or two and wait a few days to see what happens.

    However, if you shake the beetles into a bucket of soapy water (not spraying it on the leaves), they will drown.

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