What are BAg Worms?
A bag worm is a caterpillar that builds a cocoon using silk twigs leaves and needles of its host plant. Treatments are done in late may and June while the larva are still young. Trees with bag worms will be thoroughly sprayed so the insect will ingest the insecticide while they feed on the host plant. Bag worms from the previous year should be removed in the spring, they may contain up tp 1000 eggs in each cocoon. This is how they populate rapidly and harm trees and shrubs.