Fall Webworm Infestation: Cosmetic Management for Neighbor's Neglected Trees

Billie: neighbor's trees covered in web sacks (fall webworm). Caterpillars everywhere—house, yard, pool. Neighbor uncooperative. Afraid to go outside.

Expert Clarification

Steve: fall webworm (sacks at branch ends) vs. tent caterpillar. Control options nearly nil for tall trees.

Reality Check

• Heavy defoliation possible but minimal health impact on maintained trees
• Trees releaf next spring
• Spray reach is the problem
• If reachable: Dipel or Bt (Bacillus thuringiensis)
• Otherwise: tolerate as cosmetic issue

Follow-Up: Life Cycle

Caterpillars leave webs, pupate in ground litter. Pupae → moths in spring → eggs → caterpillars. 2-3 generations/year. Raking leaf litter disturbs pupae, may reduce populations.

Key Insight

Neighbor's neglect creates neighborhood nuisance. Focus on property-line management (raking, reachable spraying) rather than expecting neighbor action. The insects are temporary and trees recover.