Priophorus sawfly

The Priophorus sawfly (genus Priophorus) is a group of insects belonging to the order Hymenoptera and the family Tenthredinidae. These insects are well-known pests that pose a threat to various deciduous trees and fruit-bearing bushes in garden and agricultural settings.

These pests primarily target species within the Rosaceae family. Raspberry and blackberry plants are the most susceptible to infestation, though these sawflies can also affect various ornamental shrubs and orchard trees when conditions for their reproduction are favorable.

The life cycle of the Priophorus sawfly involves a complete metamorphosis. Adults emerge in the spring, and females deposit eggs into the leaf tissues. Upon hatching, the larvae (often called false caterpillars) feed ravenously on the foliage. They usually undergo several larval stages before descending to the ground to pupate in the soil.

The damage caused by these insects is quite distinct. Larvae skeletonize the leaves, consuming the blade tissue and leaving only the network of major veins intact. Significant infestations lead to severe defoliation, which reduces the plant's ability to produce energy through photosynthesis, ultimately weakening the plant and lowering crop quality.

Effective management strategies combine cultural practices and chemical intervention. Recommended steps include:

• Maintaining clean cultivation by removing leaf litter where pupae overwinter.
• Encouraging natural predators and parasitoids in the garden.
• Applying insecticidal treatments during the early larval stages when they are most vulnerable.
• Regular monitoring of the underside of leaves for early signs of egg clusters or young larvae.