Click beetle Adrastus

The genus Adrastus is a group of beetles belonging to the family Elateridae (click beetles). These pests are significant in agricultural landscapes primarily due to their larvae, commonly referred to as wireworms, which live in the soil and feed on various plant tissues throughout their development.

These pests cause damage to a wide range of crops, including cereals, maize, potatoes, sugar beet, and vegetable crops. The larvae feed on germinating seeds, roots, and underground stems. Such damage results in patchy emergence, stunted growth, and in severe cases, the death of young seedlings.

The biology of Adrastus is characterized by a multi-year life cycle. Adult beetles emerge in spring to lay eggs in the soil. The resulting larvae develop over several years, migrating vertically through soil layers in response to moisture and temperature gradients to find optimal survival conditions.

Wireworm damage is often overlooked until significant stand loss occurs. They create tunnels in the roots and stems, which disrupts the uptake of water and nutrients. Furthermore, these feeding sites provide entry points for soil-borne pathogens, leading to fungal or bacterial infections that exacerbate the damage.

• Practicing crop rotation to break the life cycle of the pest.
• Implementing regular tillage to expose larvae to natural predators and desiccation.
• Using insecticidal seed treatments to provide early-season protection.
• Applying granular soil insecticides during sowing if population levels exceed thresholds.