Eco-friendly Control of Bagworms
Check your trees and shrubs for clusters of needles or leaves bound by silken threads. These are the homes of bagworms. The worm-like immature stage of these insects feed on over one hundred varieties of plants. Early detection and removal will help limit the damage in an eco-friendly way.
Fortunately, nature helps keep these pests under control. Birds will feed on the larvae. And the much smaller parasitic wasp and flies also help control these pests. If bagworms are an ongoing problem, consider planting asters and daisies near those plants. The flowers help attract the beneficial insects to the plants and help keep the bagworm populations under control.
Remove the bags when they are found. You’ll have the best results by removing them fall through early spring before eggs hatch. Each bag contains 300 to 1,000 eggs, so a bit of handpicking can have major benefits.
A bit more information: Bacillus thuringiensis (kurstaki strain) is a naturally occurring bacterium that only kills leaf and needle eating caterpillars. It is most effective against the young (1/2 inch or smaller) bagworms.