Traps can fill with hundreds if not thousands of beetles in just a few days. This inability to transfer stock relates to tremendous economic losses to nursery growers. In the nursery industry, it is important to be able to distinguish the larvae of Japanese beetles from the larvae of other white grubs, which may be permitted into other states. There are numerous other insects that are relatively similar to the Japanese beetle. This group is large and widely distributed, and all its members are plant feeders.
Adults generally feed at night on foliage and flowers.
The grubs feed in the soil on roots of grasses and other plants. Undoubtedly, you will become very familiar with the adults of this group of insects. Foliage-feeding adults and larvae skeletonize the leaf surface or chew holes in the leaves. Damaged leaves may turn yellow or brown and drop prematurely. This group also includes the flea beetles, which are metallic and often jump when disturbed.