Bagworms

Bagworms are caterpillars that make distinctive spindle shaped bags on a variety of trees and shrubs.  They attack both deciduous trees and evergreens, but are especially damaging to juniper, arborvitae, spruce, pine, and cedar.  Large infestations of bagworms can strip plants of their foliage and eventually cause them to die.  Bagworms pass the winter as eggs inside the bag that contained the previous year’s female.  An insecticide application will be needed to prevent serious damage.