Lepthyphantes leprosus

Lepthyphantes leprosus is a spider species belonging to the Linyphiidae family. While often considered beneficial in outdoor ecosystems as natural predators, they frequently colonize greenhouses and storage facilities, becoming a nuisance for commercial growers who deal with high-density crop production.

These spiders thrive in humid and sheltered environments, frequently found in the structures of greenhouses. They primarily affect vegetable and ornamental crops by weaving extensive webs between leaves and stems. This physical interference can lead to reduced light penetration, which inhibits the photosynthetic capacity of the affected plants.

The life cycle of this species is characterized by high reproductive rates in stable greenhouse environments. Eggs are deposited in silk cocoons, and the spiderlings develop through several instars. Due to their small size and ability to inhabit crevices, populations can quickly establish themselves if sanitation protocols are neglected.

Economic damage is primarily cosmetic and technical. The presence of dense webbing significantly lowers the marketability of ornamentals and complicates the harvest process. Furthermore, the silk structures interfere with pesticide spray applications, acting as a physical shield that prevents chemicals from reaching the leaf surfaces where actual phytophagous pests reside.

Control strategies should focus on integrated pest management (IPM). Key actions include:

• Regular sanitation and manual removal of webs.
• Adjustment of relative humidity to levels less favorable for spider activity.
• Targeted use of acaricides when population density exceeds economic thresholds.
• Sealing cracks and crevices in infrastructure to limit nesting sites.