Pale brindled beauty

The pale brindled beauty (Phigalia pilosaria) is a moth species belonging to the family Geometridae. This pest is widely distributed across temperate regions and is known for its extreme sexual dimorphism. While males have full-sized wings and are nocturnal flyers, females are wingless and must crawl up the tree trunks to find mates and egg-laying sites.

This insect is a polyphagous defoliator, meaning it feeds on a variety of broad-leaved trees. Its primary hosts include fruit trees such as apples, pears, and plums, as well as common woodland species like oaks, birches, and elms. The larvae are particularly active in the early spring, coinciding with the critical period of bud burst.

The life cycle begins early in the year, with adults often emerging during mild winter nights. After mating, the wingless females deposit their eggs in crevices within the bark. Once the eggs hatch, the young larvae immediately begin feeding on swelling buds and expanding leaves, which makes them highly destructive to early-season vegetation.

Damage caused by the larvae manifests as irregular holes in leaves, often leading to complete defoliation of the tree branches in cases of high infestation. Beyond the foliage, the caterpillars may also feed on developing blossoms, directly reducing the fruit set for the season. Defoliation weakens the tree, affecting its general health and vigor.

Management strategies for this pest are focused on interrupting the female's migration to the canopy. Sticky bands applied around tree trunks in late winter are very effective at trapping the flightless females before they can lay eggs. If the infestation level is high, chemical control using contact or systemic insecticides should be applied as soon as the larvae begin to emerge.

• Installation of sticky tree bands in winter.
• Regular monitoring of tree buds in early spring.
• Application of approved insecticides at the larval stage.
• Encouragement of natural predators like birds and parasitic wasps.