Willow moth

The willow moth (Cleoceris viminalis) is a species of moth belonging to the family Noctuidae. It is classified as an agricultural and forestry pest, specifically known for its larvae's impact on willow plantations and ornamental trees.

The primary hosts of this species include various willow species (Salix) and occasionally poplars (Populus). The damage is caused by the caterpillars, which feed on the foliage during their growth stage, potentially leading to significant defoliation of the trees if the infestation is severe.

The lifecycle of the willow moth typically follows a univoltine pattern, meaning it produces one generation per year. The insect overwinters in the egg stage, which is deposited on the bark near the buds. Upon hatching in the spring, the larvae immediately begin feeding on fresh leaves, completing their development before pupating in the soil during early summer.

The feeding damage is characterized by ragged holes in the leaves or complete destruction of the leaf tissue, leaving only the primary veins. Excessive defoliation inhibits the tree's ability to photosynthesize, which can cause significant stress, reduced vigor, and increased susceptibility to other environmental stressors or pathogens.

Effective pest management for Cleoceris viminalis involves several strategies. Regular monitoring of host plants in late spring is crucial for timely intervention. Recommended methods include:

• mechanical removal of infested leaves in early stages;
• application of biological insecticides containing B.t. (Bacillus thuringiensis);
• chemical control using selective insecticides during the peak of larval activity.