Japanese Beetles are 3/8 inch long metallic green beetles with copper-brown wing covers. Adults emerge from the ground and begin feeding on plants in June. Individual beetles live about 30 to 45 days, highest activity is concentrated over a four to six week period, beginning in July. They usually feed in groups, starting at the top of a plant and working downward, and prefer plants exposed to direct sunlight. A single beetle does not eat much; it is group feeding by many beetles that causes the severest damage. Adults feed on the upper surface of foliage, chewing out tissue between the veins. This gives the leaf a characteristic skeletonized appearance.

These little bastards have totally destroyed one of my largest rose bushes this June. I bought a Spectracide beetle trap that uses sex attractants to trap the beetles in a large, throwaway bag. This trap usually catches four to five hundred beetles a day, but it doesn't seem to be enough. There are still enough beetles left to eat my rose bush, swarm me when I'm leaving through my front door, and sneak inside and visit me in the shower. Yuck.