Crepidodera nana

Crepidodera nana is a species of beetle belonging to the family Chrysomelidae (leaf beetles) and the order Coleoptera. This small insect is recognized as a specific pest that primarily targets various species within the Salicaceae family, particularly willows, causing localized damage to foliage.

The primary host plants for this pest include different varieties of Salix. The beetles and their larvae feed exclusively on the leaves, which makes nurseries, ornamental parks, and riparian willow plantations particularly susceptible to infestation during the growing season.

The biological cycle involves the hibernation of adult beetles in leaf litter or the upper soil layer. As temperatures rise in spring, they emerge to feed on developing leaves and mate. The females lay eggs, and upon hatching, the larvae continue the feeding process, contributing to the total damage caused to the host plant.

Damage is characterized by distinct shot-hole patterns or irregularly shaped perforations in the leaf blades. Significant grazing by larvae and adults can lead to premature leaf drop, stunted growth, and a reduction in the overall aesthetic quality and physiological vigor of the willow trees.

Effective management strategies for Crepidodera nana involve both cultural and chemical control measures. Sanitation is vital; clearing debris and fallen leaves in autumn reduces overwintering sites. For severe infestations, the application of targeted insecticides during the larval stage is recommended to prevent widespread foliage loss.

• Monitor willow plantations regularly for early signs of leaf perforation.
• Remove and destroy infested plant debris in late autumn.
• Promote the presence of natural predators and parasitoids.
• Apply environmentally safe insecticides if threshold levels of infestation are exceeded.