Description: Metallic green/copper adult grows to 1/2" long.
Larvae or grubs are grayish-white with brown head; fat
body is 3/4" long. Adults especially like beans and
corn but will eat almost any plant, often skeletonizing
the leaves. Larvae chew on roots of lawn grass, bean,
beet, sweet corn, onion and tomato; except during cultivation,
they are seldom noticed, but their root pruning action
severely reduces crop yields and can kill grass. Growth
of grubs and root damage is mostly in June. Adults cause
damage from late June to early September.
Solution: To protect
lawn grass roots from chewing damage, apply Grub-Away Nematodes at the rate of
10 million per 600 sq. ft. of lawn. For adult beetles
use Neem-AwayTM Insect
Spray to repel beetles; PyolaTM Insecticidal
Spray or Liquid Rotenone/Pyrethrin to kill
them; or Japanese Beetle Traps with pheromone
lures to mass-trap them. Set out traps in mid-June,
before beetles emerge, preferably in sun, 50 feet or
more downwind of vulnerable plants.