Arborist b 480-969-8808Bagworm

Bagworm

Bagworms eat leaves of many trees and shrubs. Larvae hatch in May or June and immediately begin feeding. Each larva constructs a bag that covers its entire body. Larvae pupate in the bags. When adult males emerge from pupal cases, they fly to find females and mate. After mating, the female lays eggs in the bag and it overwinters on a tree or shrub. Larvae emerge in spring to continue the cycle.

Damage
Leaves are chewed and branches or entire plants may be defoliated. Brown, 1- to 3-inch-long "bags" hang from the branches.

Control
Spray with Bacillus thuringiensis (Bt) between late May and mid-June to kill young worms. Handpick and destroy bags in winter to reduce the number of eggs and young the following year.


 

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