Lackey Moth Caterpillars Defoliating UK Trees and Hedges

Massive webs with black/brown caterpillars on trees and hedges in southern Britain are Lackey moth (Malacosoma neustria) larvae. They build silken tents, feed gregariously, and can strip foliage.

Control

1. Bt (Bacillus thuringiensis): Spray foliage when larvae small. Organic, specific.
2. Physical removal: Prune/destroy tents early morning/evening when caterpillars inside.
3. Open webs: Allow birds/predators access.

Lifecycle

• Eggs hatch early spring with leaf-out.
• Tents regulate temperature for growth.
• One generation per year.
• Trees usually recover fully.

Monitor hedges; treat early to prevent total defoliation.