Variable click beetle

The variable click beetle (Lacon variabilis) is a beetle species belonging to the family Elateridae. While the adults are generally harmless, their larvae, commonly referred to as wireworms, are recognized as serious subterranean pests in many agricultural environments throughout their distribution range.

The biological cycle of this species is complex and usually extends over several years. The larvae spend most of their life in the soil, which makes them particularly difficult to detect and manage. Depending on environmental conditions like soil moisture and temperature, the larval stage may go through multiple instars before pupation.

The host range of Lacon variabilis is quite broad, impacting cereals, maize, potatoes, and various vegetable crops. Wireworms feed on germinating seeds and the root systems of young plants. This feeding activity disrupts the uptake of nutrients and water, often resulting in stunted growth or plant mortality.

The economic impact of the pest is determined by the density of the larval population in the soil at the time of sowing. Severe infestations often lead to significant reductions in plant stand, requiring remedial actions to save the crop. Their ability to move vertically through the soil profile allows them to avoid unfavorable conditions.

• Rotation of crops to disrupt the life cycle of the pest.
• Thorough soil cultivation to expose larvae to natural predators and desiccation.
• Monitoring adult beetle activity with pheromone traps.
• Seed treatment with appropriate systemic insecticides.
• Effective management of perennial weeds that host wireworm populations.