Today we continue with our series on the common tree diseases and insect pests in the Chicago area to discuss an invasive pest, the Japanese beetle.  Japanese beetles (Popillia japonica) are native to Japan but considered an invasive species in the U.S. as they are known to feed on the leaves of more than 300 species of plants including bushes and trees.  Adult Japanese beetles skeletonize leaves, destroying the foliage of affected plants and...