Live Oak Tussock Moth Caterpillars: Identification and Management

Identification

South FL live oak: insects with white backs + spikes. = Whitemarked Tussock Moth (Orgyia leucostigma) caterpillars.

Biology & Impact

• 2–3 generations/year.
• Spring hatch → disperse on silk → feed on oak (preferred).
• Late instars crawl everywhere — spin cocoons on houses, boats, furniture.
• Defoliation: 2+ consecutive years + other stress = tree death risk.
• Hairs irritate skin (wear long sleeves handling cocoons).

Management Options

Decision

Large oak: usually no treatment needed (cosmetic/nuisance). Treat only high-value shrubs beneath. Cocoons on structures = nuisance removal.