Polydrusus obliquatus

Polydrusus obliquatus is a species of broad-nosed weevil belonging to the family Curculionidae, order Coleoptera. These insects are commonly referred to as leaf weevils due to their feeding habits. They are widely distributed throughout temperate regions, often posing a nuisance in orchards and forested areas where they feed on deciduous foliage.

The pest primarily targets various deciduous trees, including key horticultural crops such as apple, pear, cherry, and plum trees. They may also be found on hazel and oak. Because these weevils synchronize their life cycle with the early spring budding phase of host plants, they can cause significant stress to trees at the very beginning of the growing season.

The life cycle involves complete metamorphosis, with the larval stage typically occurring in the soil. The larvae feed on small roots and organic matter, while adults emerge from the soil in spring to climb into the tree canopy. After mating, females deposit eggs, and the cycle continues as the next generation of larvae prepares to overwinter in the soil profile.

Damage is characterized by the irregular gnawing of leaf margins, often leaving a jagged, lace-like appearance. In severe infestations, adults can consume buds and young shoots, severely stunting tree development and reducing photosynthetic output. Root damage caused by larvae is less visible but can impact the overall nutrient uptake and long-term health of younger trees.

• Application of contact or systemic insecticides during the peak activity period.
• Mechanical collection and destruction of beetles from canopy shaking.
• Cultivation of soil in the root zone to disrupt pupation and larval survival.
• Monitoring pest populations using pheromone traps or sticky barriers on tree trunks.