Caterpillars on Weeping Willow: Late-Season Feeding and Next-Year Prevention

Identification

Tiny worms on leaves = caterpillars (various species). Without description, exact ID impossible.

Insecticides: diazinon, carbaryl, malathion, pyrethrum, Bacillus thuringiensis (Bt).
Check local nursery/garden store for these products.

Fall feeding causes minimal damage (leaves senescing). However, controlling now reduces next year's population.

Plant Diseases: Weeping Willow with Bark Loss and Deformity: Internal Decay, Removal Advised; Weeping Willow Red Spiky Patches: Adventitious (Air) Roots, Not Borers—Harmless, Dry Up; Weeping Mulberry Leaf Spots and Yellowing: Likely Minor, Check Roots; Willow Weevil/Leaf Beetle: ID First, Then Treat; Willow Tree Partial Leaf Yellowing: Water Needs and Trunk Check; Jasmine Tree Leaf Drop: Cold Snap, Water, or Insects?; Scale on Weeping Willow: Baking Soda Won’t Work—Use Proper Insecticide; Black Spots on Weeping Willow: Late-Season Cleanup and Spring Spray Plan; Weeping Willow Decline: Roundup Drift vs. Borer Damage; Weeping Willow with No Leaves: Time to Say Goodbye

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