November Moth

The November moth (Epirrita dilutata) is a moth belonging to the family Geometridae. This species is widely distributed across temperate regions of Europe and Asia, often found in woodland habitats, hedgerows, and commercial orchards where its larvae can reach pest status.

This insect is a polyphagous pest, meaning it feeds on a wide range of host plants. Its larvae primarily target various deciduous trees and fruit-bearing species, including apple, pear, plum, cherry, as well as forest trees like oak, birch, elm, and beech, causing significant defoliation.

The moth has a univoltine life cycle, meaning one generation per year. It overwinters in the egg stage, with eggs typically deposited on the bark of host trees near the buds. Upon hatching in the spring, the larvae immediately begin feeding on swelling buds and newly emerged foliage.

Damage caused by the larvae is characterized by leaf consumption. Early-stage caterpillars skeletonize the leaves, while later instars consume entire leaf blades, often leaving only the main veins. High population densities can lead to severe canopy thinning, stressing the host plants and reducing vigor.

Effective management requires a combination of monitoring and intervention. Recommended control strategies include:

• Applying biological insecticides during the early larval stages.
• Installing sticky bands on tree trunks to prevent migration.
• Encouraging natural predators such as birds and parasitic wasps to regulate populations.