Black weevil

Systematic position. The black weevil (Lat. Agasphaerops nigra) belongs to the order Coleoptera and the family Curculionidae. This species is recognized as a significant pest within specific agricultural and forestry ecosystems, requiring precise identification and monitoring to prevent economic losses in affected plantations.

Affected crops. The pest primarily targets members of the Rosaceae family. It is particularly problematic in nurseries and young orchards, where the feeding behavior of adults and larvae can jeopardize the development of both fruit-bearing trees and ornamental shrubs, causing stunted growth and poor structural health.

Biology and life cycle. The life cycle of Agasphaerops nigra is synchronized with the phenological stages of its host plants. Adults typically overwinter in the soil or under leaf litter, emerging in early spring as temperatures rise. The subsequent reproduction and egg-laying processes are highly dependent on the availability of tender plant tissues, which serve as the initial food source for the developing larvae.

Nature of damage and economic impact. Adult beetles feed on developing buds and young bark, often resulting in significant tissue loss. The larval stage is often more destructive, as larvae may mine into stems or damage roots, which disrupts nutrient flow within the plant, leads to canopy dieback, and can ultimately result in the total mortality of young nursery stock.

• Application of systemic or contact insecticides during the early spring bud-burst phase.
• Rigorous field sanitation, including the removal of infested plant debris.
• Cultivation and tillage of soil around the root zone to disrupt the life cycle of pupating insects.
• Monitoring of populations using pheromone traps to time treatments accurately.
• Implementation of regular nursery inspections to catch infestations at an early stage.