Green dock beetle (probable)

Moist areas with dock and sorrel plants, especially grasslands, gardens, and stream margins. Adults may occasionally wander onto indoor walls.

Adults and larvae mainly eat leaves of dock (Rumex) and related plants, often creating round holes or skeletonizing foliage.

Adults are metallic green but may appear dark or bluish in poor lighting. Females lay clusters of eggs on host plants; larvae feed openly before pupating in the soil.

Harmless to people, pets, buildings, and stored food. It can damage dock foliage but may help regulate invasive dock plants and serves as prey for birds and predatory insects.