Insect ABC's
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Adult Japanese beetles are 3/8-inch long metallic green beetles with copper-brown wing covers. Many types of bird feed on Japanese beetles when they are stil grubs hiding in the soil. The Japanese beetle spends ten months in the soil as a grub, feeding on the roots of living plants. The beetles live 30 to 45 days, activity is concentrated into 4-6 week peiord after which they begin to die.
Photo Courtesy of: http://www.eden.rutgers.edu/~zhxin/photos/macro%insects/beetles page_01.htm   Source: http://www.uky.edu/Agriculture/Entomology/entfacts/trees/ef409.htm