Click beetle Hemicrepidius hirtus

Hemicrepidius hirtus is a species of click beetle belonging to the family Elateridae within the order Coleoptera. This insect is recognized as a significant agricultural pest because its larval stage, commonly known as a wireworm, lives in the soil and feeds on the root systems and subterranean stems of various plants.

This pest affects a wide range of crops, including cereals (wheat, barley, rye), maize, sugar beet, potatoes, and sunflowers. By consuming the roots, larvae deprive plants of essential nutrients and water, which often leads to poor crop establishment, stunted growth, and a noticeable reduction in final yields, particularly in young, sensitive crops.

The biology of this species involves a multi-year life cycle during which larvae remain in the soil. They are highly mobile and adapt well to different soil conditions, moving deeper into the ground during cold or dry periods and rising to the root zone when conditions are favorable for feeding. The adult beetles are also active in the field, primarily during the spring and early summer.

Damage caused by wireworms is often detected through missing or yellowing plants in the field. Because they feed on the underground parts, the injury is not immediately visible until the plant begins to wilt or die. These wounds also serve as entry points for soil-borne pathogens, leading to secondary rot and further weakening the plant's structural integrity.

Integrated pest management (IPM) is essential for controlling Hemicrepidius hirtus. Recommended practices include deep autumn plowing to bring larvae to the surface, effective weed management to remove host plants like couch grass, and the use of chemical seed treatments. Monitoring population density using pheromone traps or soil sampling is critical for determining the necessity of intervention.