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Fall Webworm Sacks on Walnut in Ohio: Identification and Control

Question: Foot-long webby sacks on walnut in Dayton, OH killing tree. What and how to remove?

Answer

Fall webworm (Hyphantria cunea). Webs enclose branch tips; caterpillars skeletonize leaves. Usually late-season, minimal damage. Prune small nests, crush. Spray Bt, diazinon, Orthene, or Sevin for large nests. Systemic soil injection for tall trees.

Trees: Wood-Boring Insects in Lilac: Understanding "Wood Worm" Concerns; Fall Webworm Nests in Trees: Harmless but Ugly—Management Options; Fall Webworms on Locust Trees: Identification and Control Options; Mimosa Webworm on Mature Honey Locusts: Treatment Timing and Options; Identifying and Controlling Bagworms on Cypress Trees; Starting Catalpa Worm Population on Your Trees; Removing Sooty Mold from Decks Near Elm Trees; Wasps Digging at Ash Tree Base: Ground Nesters, Not Borers; Peach Tree Pests: Identify and Control the "Worms" Ruining Your Fruit; Oak Moth Outbreak Defoliating Trees: Temporary and Cyclical

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