Earth wolf spider

Systematic position. The Earth wolf spider (Trochosa terricola) belongs to the order Araneae and the family Lycosidae. These spiders are terrestrial hunters that do not build webs but patrol the ground, making them common inhabitants of agricultural fields where they interact with various insect populations.

Affected crops. As predators, they do not feed on crops directly. However, they are frequently found in wheat, corn, and vegetable fields. Their impact is primarily ecological, as they interact with both beneficial and harmful insects living in the rhizosphere and on the soil surface, potentially altering the balance of the local agricultural ecosystem.

Biology and life cycle. The life cycle involves egg, nymph, and adult stages. Females exhibit advanced maternal care, carrying the egg sac and spiderlings on their abdomen. They prefer moist habitats with dense vegetation or mulch, which provide essential shelter. Their population density is usually higher in fields with poor tillage practices or excessive surface debris.

Damage and harmfulness. The primary concern is the disruption of biological control. By preying on beneficial insects like ground beetles (Carabidae) and hoverflies, they can indirectly trigger outbreaks of primary crop pests. When the population of these spiders is uncontrolled, the natural predatory pressure on aphids or larvae of Lepidoptera may decrease significantly.

Control measures. Management of these populations focuses on cultural control methods to reduce habitat suitability. Key practices include:

• deep tillage to disrupt the overwintering sites;
• maintenance of clean fallows to remove weeds that provide moisture and cover;
• rotation of crops to prevent the accumulation of soil-dwelling arachnid populations;
• avoiding excessive mulching in areas where spider presence is high.