Hairy weevil

The Hairy weevil (Polydrusus pilosus) is a beetle belonging to the order Coleoptera and the Curculionidae family. Known for its distinct appearance, the adult beetle is covered in tiny scales that provide excellent camouflage against tree bark and foliage. This insect is a known agricultural pest that primarily targets deciduous trees, causing significant disruption to plant growth during the spring season.

The pest has a wide range of host plants, including major fruit species like apple, pear, cherry, and plum trees. Furthermore, it is often found on broad-leaved forest trees such as oak, birch, and beech. The damage is particularly severe in nurseries and young orchards where the loss of foliage can stunt the development of saplings and make them more susceptible to subsequent diseases and environmental stress.

The life cycle of the Hairy weevil involves both aerial and subterranean stages. Adults emerge in the spring to feed on buds and young leaves. After mating, females lay eggs in the soil or on the host plant. The larvae that emerge then move into the soil, where they consume root systems. This dual-feeding habit makes the pest challenging to manage, as both the roots and the canopy are subjected to consistent pressure.

Feeding damage is typically characterized by scalloped edges on the leaves, a signature sign of weevil activity. In cases of high population density, these insects can cause extensive defoliation, leading to reduced photosynthetic capacity. This impairment prevents the tree from storing necessary carbohydrates for the following year, which often results in smaller fruit yields and weakened overall tree vigor.

• Cultivating the soil in orchards during autumn and spring to expose and destroy larvae.
• Installing sticky bands on trunks to prevent adult weevils from migrating upward into the canopy.
• Monitoring pest populations using visual inspections during the critical bud-burst stage.
• Applying appropriate insecticidal treatments when the economic threshold of damage is exceeded.
• Maintaining healthy tree vigor through proper fertilization and irrigation to mitigate stress.