Japanese Beetles

Japanese_Beetle_Pest_ControlJapanese Beetle:

While it’s called Japanese beetle, it does not pose as a big threat to Japan as it is controlled by natural enemies. In America, it is considered a pest to about 200 species of plants. Some popular plants include rose bushes, many small fruits, weeds, grasses, tree fruits, and myrtle. Japanese beetles feed on most of these and about 400 other plants, but their preferable taste ranges from 50 different species. Japanese beetles can mostly be found in northern and eastern states in fruit-growing areas. They were accidentally imported to the United States in 1916 and first found in New Jersey. The numbers in the population of the Japanese beetle are immense during summer.

The Japanese Beetle is most commonly known as the scarab beetle, and it’s about 3/8th of an inch long. This oval-shaped beetle is easy to recognize by its metallic green head and hoax with copper wings.  The Japanese Beetle is known to be a generally clumsy flier during the beginning of their life cycle, but the adult beetles are pretty adept, sometimes traveling in large swarms.  When the adult Japanese beetle feels threatened, it will fake its death and drop whatever it is holding. It is known as a “lovely but destructive creature.”

Life Cycle of Japanese Beetles:

Japanese beetles can usually be spotted from the beginning of July to the end of September, but their peak months are June and July. After mating, the females lay 1-5 eggs in a burrow with a depth of about 2-4 inches. Females feed, mate, and lay eggs about every two days. Within two weeks, the hatched eggs, C-shaped grubs in its larval stage, will eat from July to early August. These young white grubs will hibernate during the winter and start to feed in May and June. After about one to two weeks, these grubs will pupate and after another one to three weeks; they will become adults. In total, before the Japanese beetle reaches its adult stage, it spends about 10 months within the soil. The Japanese beetle keeps reproducing after one year.

Diet of Japanese Beetles:

The Japanese beetle mainly feeds on small fruits or tree fruits, but their diets range all the way from rose bushes to poison ivy! While they are known to be an especially troubling pest, there are a few characteristics that they exhibit when they feed. They’re known to completely devour the plant, leaving just a skeleton. For example, the leaf itself would be completely gone, but the stem is left completely intact. The Japanese beetle is known to be a very destructive beetle because it totally destroys the plant, flower, fruit, or leaf that it is feeding on. When an adult Japanese beetle is feeding on something, it releases a congregation pheromone which attracts other adult Japanese beetles.

How to Control Japanese Beetles:

One of the most effective ways to get rid of this pest is a pheromone trap. The main method, without the use of any pesticides, is to handpick the beetles off of plants and trees. Also, there are some plants that repel the Japanese beetle such as garlic, catnip, chives, tansy and rue. Natural enemies are wasps and birds. It is very unlikely that you could have full control over the Japanese beetle, given their nature and the ability to call other Japanese Beetles to feast, as well.

Beetle Bagger Japanese Beetle Trap Kit


Date: Saturday, 27. March 2010 14:36
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  1. 1

    I hate beetles! Just the site of them make me squeal! I just purchased one of those pheromone traps. Cant wait to use it. Thanks pestmall!

    – Joe

  2. 2

    Thank you, Joe!

    I hope you find the traps effective and rid yourself of those pesky pests!
    You can also leave testimonials on our site in the forum section.
    Have a great day 🙂

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