Japanese Beetle, a destructive insect that attacks the foliage, blossoms, roots, and fruit of plants. It was introduced into New Jersey about 1916, later spreading over many states east of the Mississippi. It is a serious pest in the United States, but is no problem in its native Japan because natural enemies keep its numbers in check.The Japanese beetle is a small metallic green and brown scarab beetle.
The beetle's shiny, metallic-green body is about one-half inch (13 mm) long. Its wings are coppery brown. The adult beetles, which live about two months, usually appear in early summer. They fly only during the day. From time to time, the females stop feeding and burrow under the ground to lay eggs. The white grubs grow to about one inch (2.5 cm) in length. They feed chiefly on decaying vegetation and grass roots. They pupate in the spring; about 10 months of the insect's life is spent as a grub.The Japanese beetle has a shiny, metallic-green body about one-half inch long.
Japanese beetles are controlled by spraying or dusting with insecticides. Natural enemies include certain insects and birds.
The Japanese beetle is Popillia japonica of the scarab family, Scarabaeidae, of the order Coleoptera.