Japanese beetles are metallic green with copper-brown wing covers. Beetles emerge from the ground in June and feed on more than 300 different plants. They live 30-45 days. During that time females lay 40-60 eggs in the soil. The grubs hatch after 8-14 days and spend 10 months underground feeding on plant roots and organic matter. Their one-year life cycle comes full circle as adults emerge the next June.
Adult beetles feed in masses and tend to prefer plants in direct sun. Their presence attracts more beetles as they emit pheromones (odors) that attract other beetles to feed and mate. Hand picking beetles in the early morning is an effective control. Simply pick or shake off beetles in a bucket of soap water.