Washington State Department of Agriculture (WSDA) is actively working to eradicate Japanese beetle (Popilla japĆ³nica) from Washington. Japanese beetle has been detected in Yakima, Benton, Franklin, and south King counties. Japanese beetles hitchhike and move in soil, potted plants, backyard compost, field or yard waste, sod, cut flowers, and plants.
Japanese beetles feed on over 300 plants, including lawns, roses, grapes, apples, and hops. The pest threatens gardens, parks, farms, and following costly quarantines could make moving agricultural and nursery products difficult. We need your help to watch for and report Japanese beetle sightings.
Spot Japanese beetles
Adult beetles can fly and are active in the summer. They do not sting or bite. They:
- are about 1/3 – 1/2 inch long.
- have a metallic green head and thorax.
- have copper wing covers.
- have patches of white hair on the body—five on the side and two on the tip.
This pest has some common imposters. Compare differences by viewing the Japanese beetle look-alike like guide.
Japanese beetle grubs, or larvae, live in soil. Many other species look similar and a specimen is needed to confirm an identification. They:
- are 1/8 – 1 inch long.
- are white and C-shaped.
- have a tan-brown head with visible legs.
- prefer to feed on grass roots.
Report Japanese beetles
Be on the lookout as Japanese beetle are emerging. If you suspect you see a Japanese beetle, please report it! Note the location, take a picture, and collect the specimen if possible. There are several ways to report suspected sightings.
Stay connected
The Japanese beetle eradication program is a multiyear project. Together, WSDA, community members, landowners, and growers can win the fight against this invasive pest.
