TreePro, Inc.

Are your Arborvitae thinning out? Have you noticed patchy brown spots? The bagworm may be to blame. These bag-like cocoons contain 500-1,000 eggs! Once hatched, the larvae feed on the needles and leaves of the host plant causing damage that will eventually kill your evergreen trees and shrubs. Many times this damage is undetectable until too late. A certified arborist can help. Give Craig a call at 401-623-1957
http://ento.psu.edu/extension/factsheets/bagworm