Pale leaf weevil

Systematic position: The pale leaf weevil (Polydrusus pallidus) belongs to the order Coleoptera and the family Curculionidae. Like other members of the genus Polydrusus, it is recognized by its snout-like rostrum and specialized mandibles adapted for feeding on various plant tissues.

Affected crops: This pest is a polyphagous insect that primarily targets woody plants. Common hosts include fruit trees such as apple, pear, cherry, and plum. It is also frequently found on deciduous forest trees like oak, birch, and hazel, which can act as reservoirs for the pest near agricultural zones.

Biology and life cycle: The species undergoes complete metamorphosis. Larvae typically overwinter in the soil, feeding on the root systems of various plants. In the spring, they pupate, and adult beetles emerge during the bud-burst stage. Adults feed on foliage during the spring and early summer before laying eggs in soil crevices or bark.

Damage and economic impact: Adults feed on leaves and buds, creating irregular, scalloped notches along the leaf margins. While moderate damage is often tolerated, heavy infestations can lead to significant defoliation, stunted growth, and reduced yields. Young saplings are particularly vulnerable to extensive leaf loss caused by these beetles.

Control measures: Managing Polydrusus pallidus requires an integrated approach. Cultural practices such as regular tilling of the soil around trees can disrupt the pupal stage. Manual removal is effective in small gardens. In larger orchards, professional monitoring followed by targeted insecticide application during the peak emergence period provides the best results.