In one sense bagworms are not an especially devastating pest.  They have only a single generation each year (therefore are relatively slow to establish) and they don’t spread very quickly, because the female bagworms are wingless.  On the other hand, they are well protected from many pesticides by their tight, water-repellent bags.  They are also one of our few chewing pests that will tackle evergreen trees and shrubs. If you’ve ever seen a deciduous tree (one that loses its leaves in the fall) defoliated by caterpillars you may… Read More →