Japanese Beetle Solutions

Japanese Beetles and What to Do if they Attack

What is a Japanese Beetle?

The adult Japanese beetle is metallic green and copper and grows to ½" long. Larvae or grubs are grayish white with a brown head, and their fatty bodies are about ¾" long. The adults especially like beans and corn but will eat almost any plant, often skeletonizing the leaves. Larvae chew on the roots of lawn grass, beans, beets, sweet corn, onions and tomatoes. Growth of grubs and most of the root damage happens in June, and damage from adults occurs late June to early September.

How to spot a Japanese Beetle Infestation:

Most often you'll only see adult Japanese beetles while they're eating flowering plants in late June to early September. However, when the grubs eat away at your plant roots in June, they severely reduce crop yields and can kill grass. The grass will turn yellow and brown where they've fed on the roots, and because the roots are no longer keeping the blades attached, you'll be able to pull it up easily. You'll most likely spot the adult beetles during the day in clusters of twenty or more hanging from fruit or flowers. To look for Japanese beetle grubs, push a spade just under the sod and turn it back. If you have a significant grub problem, you'll be able to see them.


« Back to Solution Finder

Related products

  • Surround® At Home® Crop Protectant

    Like a coat of armour for your plants, Surround At Home is a broad-spectrum protectant that forms a barrier to control aphids, Japanese beetles, leafhoppers, crickets, thrips, grasshoppers, whiteflies, cutworms, weevils and loopers. Surround At...

    Read More
  • Japanese Beetle Trap

    When squadrons of adult Japanese beetles attack, be ready with our highly effective pheromone trap. Just set the trap in mid June and get ready to catch beetles all summer long. With no spraying needed, there's no mess and your corn, roses...

    Read More
  • Pyola® Insect Spray

    Pyola Insect Spray is easy to use, fast acting and can be used up to the day of harvest. This fast and effective solution eliminates a wide range of insect pests from aphids and ants to larvae, beetles and f lies of all types. If it's a bug and...

    Read More

Sign-Up and Save

You’ll enjoy…

  • • Exclusive offers and specials
  • • First access to new products
  • • $25 off your first order of $50+

Gardens Alive!® respects your privacy. Unsubscribe anytime.

Close Pop Up