Willow sawfly

Systematic position: Pteronidea miliaris belongs to the order Hymenoptera and the family Tenthredinidae. This species is recognized as a specific defoliator of willow trees (Salix), often causing significant aesthetic and physiological damage to host plants in both natural and managed environments.

Host plants: The primary hosts are species within the Salix genus. These sawflies are frequently found on basket willows, ornamental willow cultivars, and various wild species, often causing heavy damage to plantation-grown trees used for biomass production or landscaping.

Biology and life cycle: The life cycle involves complete metamorphosis: egg, larva, pupa, and adult. Females deposit eggs into leaf tissue, often near the veins. Larvae are typically gregarious during their early stages of development. Depending on the climate, the pest can complete multiple generations within a single growing season.

Nature of damage and pest status: Larvae are voracious feeders that consume leaf tissue. They initially cause skeletonization of the leaves, but as they mature, they strip the entire leaf blade, leaving only the primary veins. Severe infestations can lead to total defoliation of the tree, causing stress, reduced growth, and sometimes plant mortality if the attacks are repeated.

Protection measures: Integrated pest management (IPM) is recommended for controlling Pteronidea miliaris.

• Regular field monitoring to detect early-stage larvae.
• Application of contact or systemic insecticides during the peak of larval activity.
• Utilization of biological agents such as Bacillus thuringiensis.
• Removal of leaf litter to disrupt the overwintering cycle of pupae.