Adults are ~15 mm, metallic green with copper elytra. Larvae (white grubs) feed on grass roots. One generation/year. Adults feed in groups, skeletonizing leaves .

Larvae damage turfgrass and crops (maize, soybeans). Adults defoliate trees (e.g., roses, birch) .

Native to Japan; invasive in North America (e.g., US, Canada) and Europe (Italy, Switzerland) .

Visual surveys. Pheromone-baited traps. Turf sampling for grubs .

Pheromone traps (e.g., Japanese beetle traps) .