Click beetle

Systematic position: The click beetle (Drasterius bimaculatus) belongs to the order Coleoptera and the family Elateridae. Within agricultural contexts, the larvae of this species are widely recognized as a significant group of soil-dwelling pests commonly referred to as wireworms.

Crops affected: The larvae exhibit polyphagous feeding habits, attacking a broad range of agricultural crops. They are particularly destructive to cereal crops, vegetables (such as tomatoes and peppers), melons, and industrial crops, especially during the early stages of plant establishment.

Biology and life cycle: The lifecycle of Drasterius bimaculatus consists of four stages: egg, larva, pupa, and adult. Adults are typically active during late spring and summer. Eggs are laid in the upper soil layers rich in organic matter. The larvae can persist in the soil for several years, feeding on roots and underground stems while undergoing multiple molts before pupation.

Damage patterns: The primary economic damage is caused by the larvae. They feed on germinating seeds and sever roots or subterranean stems of young plants. This feeding activity results in thin plant stands, stunted growth, and sudden wilting of crops. Heavy infestations can lead to complete field failure if not managed correctly at planting time.

Control measures: Effective management of Drasterius bimaculatus requires an integrated pest management approach:

• Regular soil tillage to disrupt larval habitats and reduce pest population levels.
• Implementation of proper crop rotation to minimize food sources for the larvae.
• Use of seed treatments with systemic insecticides to provide early-season protection.
• Application of soil-incorporated granular insecticides in fields with high wireworm populations.