Japanese beetles are definitely a scourge for tree/shrub growers. They are without question the most destructive pest to deal with in our area...by far . They alone make it nearly impossible to grow an apple without routine pesticide spraying, which is a real shame. Apple trees will never get to a size or age where they will be able to produce well without routine and persistent spraying. One of the older local orchards that is no longer in operation has hundreds of full sized trees planted. They get destroyed each season by the Japs. I heard that the owner was fined for "orchard neglect" as there are other nearby orchards planted with rows upon rows of dwarf trees that could suffer from unchecked diseases and pests. Whether that is the case or not, these beautiful trees used to be loaded with apples, but now look like they have the plague every season, and almost all of the apples get aborted or eaten. You would think that in this day and age that someone would come up with a way to set these things back significantly. They have to cost commercial plant/fruit growers hundreds of millions each year.