What to check first
Locate the shelter and feeding
Photograph where the web joins the branches and whether leaves are enclosed. Fork-centered tents fit eastern tent caterpillars; leaf-filled terminal webs fit fall webworms. Look for actual caterpillars rather than assuming any silk on a tree is made by one of these insects. [3] [2]
Record location and local season
Write down your state, the date and host tree. Colorado describes different web-building species and regional differences in generations. Maryland can have fall webworms beginning in spring, despite the common name. A calendar label alone is less useful than the web and larvae together. [1]
Judge the tree's vulnerability
Estimate how much foliage is affected and whether the tree is young, recently stressed or repeatedly defoliated. Healthy established trees often tolerate limited feeding. Young or unhealthy trees can need closer attention, especially when substantial foliage is lost early in the growing season. [3]
Choose the next step for your plant
Leave limited late-season feeding alone when practical
A small terminal web on an otherwise healthy tree often has little effect on its condition. Watch the amount of feeding and let predators and parasitoids work. Old dry webs may remain after activity ends, so confirm live larvae before considering any response. [2]
Remove only a safely reachable active web if necessary
When damage warrants action on a small tree, remove safely reachable webbing with the caterpillars and bag it for disposal. For an inaccessible or heavily affected tree, ask an arborist or local Extension about identification and suitable options. [3]
What to avoid
- Never burn webs in a tree; fire can damage the tree and surrounding property.
- Do not spray a high canopy or prune large branches simply because an old, empty web looks untidy.
What to watch next
After any removal, check for fresh feeding rather than expecting old chewed leaves to repair. Record repeated defoliation for next season. If treatment is justified, species, larval size, host and product label determine the option and timing; there is no universal fall-webworm spray date.
Common questions
Does every tent caterpillar build a tent?
No. Forest tent caterpillars make resting mats rather than the conspicuous permanent tents associated with eastern or western tent caterpillars. Other caterpillars also produce silk shelters. If the clues do not fit, get the insect identified before choosing a response. [1]
Does a large web mean the tree is dying?
Not necessarily. Fall webworm webs can look dramatic while enclosing only a portion of the crown. Inspect the remaining foliage and the tree's overall condition. The amount, timing and repetition of leaf loss matter more than web size alone. [2]
Sources and review
This guide was prepared with AI assistance and checked against the sources below. It has not been reviewed by a botanist. Conditions and plant responses vary; use the checks above to decide what applies. Read our editorial standards.
- Colorado State University Extension: Tent-making caterpillars
Multiple web builders, regional generations, natural enemies and avoiding harmful removal.
- University of Maryland Extension: Fall webworm on trees
Terminal webs enclose feeding; Maryland's early generation and usually limited damage.
- University of Minnesota Extension: Eastern tent caterpillars
Fork tents, young/stressed tree susceptibility and reachable web removal.