Pale-legged currant sawfly

Systematic position: The Pale-legged currant sawfly (Pteronidea myosotidis) is a member of the Hymenoptera order, belonging to the Tenthredinidae family. It is a significant agricultural pest that targets small fruit plantations, often causing localized defoliation if left uncontrolled.

Host plants: This insect primarily attacks Ribes species, specifically blackcurrant, redcurrant, and gooseberry. The larvae are specialized feeders that thrive on the foliage of these shrubs, preferring plants that are not properly pruned or managed.

Biology and lifecycle: The species typically overwinters as larvae within cocoons located in the soil at the base of the host plants. Adults emerge in late spring. The females lay eggs in batches on the undersides of leaves. Throughout the growing season, multiple generations can occur, meaning that the pest can persist on the crop from late spring until early autumn.

Damage patterns: Damage is caused by the larvae, which are often called false caterpillars. They are voracious feeders that consume leaf tissue rapidly. Initial damage appears as small holes (shot-holing), but as the larvae mature, they consume the entire leaf lamina, leaving only the primary veins. This process severely reduces the plant's photosynthetic capacity.

Protection measures: Management of the pest requires an integrated approach. Important strategies include:

• Cultivating the soil beneath the bushes in autumn to disrupt overwintering sites.
• Regular inspection of foliage during May and June.
• Prompt application of registered insecticides when larvae are small.
• Encouraging natural predators, such as parasitic wasps and birds, which can reduce population levels significantly.