05/27/2026
🐛 Tent Caterpillars: What You Need to Know 🌳
If you’re noticing silky “tents” forming in the branches of trees this spring, you’re likely seeing tent caterpillars at work. While they’re a natural part of our ecosystem, large infestations can seriously stress trees and shrubs.
🔎 What are tent caterpillars?
Tent caterpillars are the larvae of moths. They hatch in spring and build web-like nests (“tents”) in the crotches of branches, most commonly in:
• Cherry
• Apple/crabapple
• Aspen/poplar
• Birch
• Other deciduous trees
The caterpillars leave the tent during the day to feed on leaves, often stripping branches quickly during heavy infestations.
⚠️ What damage do they cause?
• Defoliation (loss of leaves)
• Stress to the tree
• Reduced growth and vigor
• Increased vulnerability to drought, disease, and other pests
Healthy, mature trees can usually recover from one season of feeding, but repeated or severe infestations can weaken trees significantly — especially young or already stressed trees.
🛠️ What can homeowners do?
✅ Remove tents early
Prune out small tents in the morning or evening when caterpillars are inside. Dispose of them in soapy water or sealed bags.
✅ Spray with soapy water
A strong spray of soapy water can help kill caterpillars directly and may help break down smaller nests.
✅ Try the shop vac method
One effective homeowner trick is using a shop vac with a small amount of soapy water in the tank. Vacuum the caterpillars directly from the trunk, branches, or tents — they drown in the tank and can then be safely disposed of afterward.
✅ Avoid burning tents
Using a torch or fire can seriously damage bark and create wounds that harm the tree more than the caterpillars themselves.
✅ Encourage natural predators
Birds, wasps, and other insects help keep populations under control naturally.
✅ Keep trees healthy
Proper watering, mulching, and general tree care help trees recover from feeding damage.
✅ Call an arborist for severe infestations
Large infestations may require professional assessment or treatment, especially if valuable trees are repeatedly affected.
A few caterpillars are usually more of a nuisance than a serious threat — but keeping an eye on populations early can help prevent bigger problems later in the season.
Have questions about your trees? Reach out — we’re happy to help identify what you’re seeing and discuss the best course of action. 🌲
