ASH SPIDER MITES
The ash spider mites feed on the leaves during the summer apparently doing little damage and then move to the trunk to overwinter. This webbing is not a common sight anywhere although the mites are reported to live throughout the United States. Cooler summers and rain may keep the phenomenon from occurring most years.
Photos: Strong, ME August 2010
MAINE DEPARTMENT OF AGRICULTURE, CONSERVATION AND FORESTRY
Maine Forest Service - Forest Health and Monitoring Division