Poplar leaf sawfly

Stauronematus compressicornis, commonly known as the poplar leaf sawfly, belongs to the order Hymenoptera and the family Tenthredinidae. This species is recognized as a significant defoliator, specializing in various poplar species (genus Populus) across forest plantations and urban landscapes throughout its distribution range.

The host range is predominantly limited to poplars, including black poplar and other related species. The larvae feed on the leaf tissue, causing visible aesthetic damage and physiological stress to the host trees. The species is capable of reaching high population densities in favorable climatic conditions, leading to severe localized outbreaks.

The life cycle consists of several stages: egg, larva, pupa, and adult. Adult sawflies lay their eggs directly into the leaf lamina. Upon hatching, the larvae begin to feed, often inducing the leaf margins or blades to roll or develop gall-like symptoms. These behavioral patterns are critical indicators for early detection and professional monitoring of the pest population.

The primary economic and environmental impact of Stauronematus compressicornis is the reduction of the photosynthetic surface area. Severe defoliation impairs the tree's ability to store carbohydrates, which reduces annual growth increments and makes the trees susceptible to secondary wood-boring insects and drought-related mortality.

Management strategies for this pest require a combination of preventative and corrective actions:

• Silvicultural practices, such as pruning damaged branches and maintaining tree vigor.
• Sanitary disposal of leaf litter in autumn to disrupt the pupation cycle of the sawfly.
• Use of biological control agents, including entomopathogenic fungi or Bacillus thuringiensis sprays.
• Targeted insecticide applications during the early larval stages when they are most vulnerable to contact or systemic treatments.