Public Works and Environmental Services

Fairfax County, Virginia

CONTACT INFORMATION: Our administrative offices are open to the public by appointment only at this time. Please call or email 8 a.m. - 4:30 p.m., Monday - Friday

TTY 711

12000 Government Center Parkway
Suite 448 Fairfax, VA 22035

Sharon North,
Public Information Officer

The Fall Webworm in Fairfax County

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Fall Webworm
Photo Credit to Ronald F. Billings, Texas A&M Forest Service

“Over the past week we have received an increase in calls to the Urban Forest Management Division from residents who are concerned about large webby tents in tree branches," said Joan Allen, Chief, Forest Pest Branch, Urban Forest Management Division, Public Works and Environmental Services. These webs are caused by fall webworm. This is a native caterpillar that spins webs over leaves of deciduous trees. There is a very noticeable increase in fall webworm in the area compared to recent years. Population levels for this pest are cyclical and it is not unusual to see population levels rise and fall over a span of a few years. This insect does not pose a serious risk to trees and native trees are well adapted to this pest. This publication from Virginia Tech has more information on fall webworm.

For more information about trees, call the Urban Forester of the Day at 703-324-1770, TTY 711.

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