Bug Identifier
Japanese Beetle
Community identification

Japanese Beetle

Popillia japonica

Order & Family
Order: Coleoptera, Family: Scarabaeidae
Size
Adults typically measure 10-15 mm (0.4-0.6 inches) in length.
See this bug in the Encyclopedia

Natural Habitat

Japanese beetles are commonly found in urban and suburban landscapes, gardens, parks, golf courses, and agricultural fields. Their grubs prefer moist, rich soil where turfgrass is abundant.

Diet & Feeding

Adult Japanese beetles are highly polyphagous, feeding on the leaves, flowers, and fruits of over 300 species of plants, including roses, grapes, beans, and corn. The larvae (grubs) primarily feed on the roots of turfgrass.

Behavior Patterns

Adult Japanese beetles are active during the day, feeding on a wide variety of plants. They are strong fliers and can travel considerable distances. Females lay eggs in the soil, which hatch into C-shaped larvae (grubs) that feed on grass roots.

Risks & Benefits

Risks: Japanese beetles are significant agricultural and horticultural pests, causing widespread damage to crops, ornamental plants, and turf. Their feeding can skeletonize leaves and reduce plant vigor. In some cases, severe infestations can kill young plants. Benefits: There are no significant benefits associated with Japanese beetles; they are primarily considered a pest species.