Common leaf weevil

The common leaf weevil (Phyllobius pyri) is a beetle of the Curculionidae family. It is easily identified by its metallic green or yellowish scales on the elytra. It is one of the most common early-season pests affecting woody plants in temperate climates.

This pest affects a wide range of fruit trees, particularly those in the Rosaceae family such as apple, pear, plum, and cherry. It also damages various deciduous forest trees. Its presence is often most noticeable in nurseries and young orchards where the foliage is tender.

The biology of Phyllobius pyri consists of one generation per year. Larvae develop in the soil, feeding on plant roots, while adults emerge in spring to feed on leaves. The mating season occurs during the peak of the leaf growth phase, which is when the most severe damage takes place.

Adult weevils cause typical damage by chewing irregular, notched patterns along the leaf margins. In cases of heavy infestation, significant defoliation can occur, reducing the tree's ability to photosynthesize and store energy for fruit production, which ultimately affects the overall crop quality.

Effective control strategies include maintaining healthy soil conditions and physical barriers in young orchards. Chemical control is often necessary if thresholds are exceeded, typically involving sprays applied during the budding stage. It is crucial to monitor the population levels before applying broad-spectrum insecticides to preserve beneficial insects.