Wireworms

Wireworms are the larvae of click beetles (family Elateridae, order Coleoptera). These soil-dwelling pests are significant threats to agriculture because they reside beneath the surface, making them difficult to detect until substantial damage to crops has already occurred.

They infest a wide range of crops including fodder beet, sunflower, winter barley, and corn. Wireworms feed primarily on underground plant structures, targeting seeds, roots, and the subterranean parts of stems, often resulting in patchy crop establishment and significant stand reduction.

The biological cycle of wireworms is complex, lasting anywhere from 3 to 5 years. Most of this time is spent in the larval stage underground, where they migrate vertically in the soil profile in response to moisture and temperature changes, moving closer to the surface when conditions are favorable for feeding.

The damage is characterized by clean-cut holes in seeds and severed roots, leading to plant wilting or complete failure of the seedlings. Their impact is often most devastating during early spring, as slow-growing plants are more vulnerable to larval feeding for a longer duration.

Effective management requires an integrated approach. Cultural practices such as crop rotation, removing grassy weeds like couch grass, and improving soil drainage are critical. Chemical control, particularly the use of insecticide seed treatments, remains the primary method for protecting vulnerable crops at the time of planting.