Popillia japonica
Invasive beetle from Japan that feeds on over 300 plant species. Adults skeletonize leaves while grubs damage lawn roots.
Adults are 1/2 inch long with metallic green heads and copper-brown wing covers. Five white tufts of hair on each side of abdomen. Grubs are C-shaped, white with brown heads.
Skeletonized leaves (veins remain, tissue eaten). Damaged flowers and fruit. Brown patches in lawns from grub feeding on roots.
One generation per year. Adults emerge in June-July, feed for 4-6 weeks, lay eggs in soil. Grubs feed on roots through fall, overwinter deep in soil, pupate in spring.
Avoid planting highly susceptible plants (roses, grapes, lindens). Don't use Japanese beetle traps near garden (attracts more beetles). Maintain healthy lawn to resist grub damage.