Japanese Beetle


Massi’s Gardens & LandscapingAdults: About 3/8" long; metallic green and bronze in color with a row of white tufts on each side of body.
Pupae: First cream-colored, becoming light reddish-brown with age. About ½” long.
Larvae: Common C-shaped white grubs found in lawns, turf or cultivated fields.
Eggs: Tiny white eggs are deposited in the soil where they hatch.
Life History: Grubs overwinter about 8" below the soil surface, moving up when the surface temperature reaches 60°. Pupation begins in June, with adults emerging through July, feeding and mating. The female burrows into the soil to lay eggs about 2-4" deep, where they hatch into grubs which begin feeding on roots and organic material. As winter approaches, the grubs burrow deeper to overwinter.

Primary Host:

Many vegetables, fruits, fieldcrops, ornamentals, turfgrass.


Larvae (grubs) feed on roots of turf-grass and other plants. Adults feed on leaves,flowers, and fruits of many plants.


Adults are not effectively controlled with scented traps.


Bio controls: Bacterial Milky Disease is effectivegiven enough time, and a parasitic nematode iseffective.
Cultural Controls:Dry soil inhibits developmentof eggs and 1st stage grubs. Don’t irrigate during that time.
Physical Controls: Hand picking. Pheromone traps may attract more beetles than they control,causing increased plant damage.

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