Barn funnel weaver

The barn funnel weaver (Tegenaria domestica) belongs to the order Araneae and the family Agelenidae. Although it is not a primary herbivore, this species is considered a nuisance in greenhouse environments and agricultural storage facilities due to its habit of weaving extensive silk webs that interfere with plant growth and greenhouse sanitation.

These spiders favor dark, humid environments, making greenhouse corners, irrigation equipment, and structural gaps ideal habitats. While they are predators that feed on insects, their funnel-shaped webs often envelop seedlings and low-growing vegetation, disrupting photosynthesis and creating stagnant air pockets that favor fungal diseases.

The life cycle of this species spans several years, allowing them to establish stable populations within protected agricultural structures. Females deposit eggs in protective cocoons hidden in cracks or crevices. Their resilience allows them to withstand fluctuations in temperature and humidity, ensuring survival throughout the year in managed greenhouse environments.

The primary economic damage caused by Tegenaria domestica is physical. The thick, dusty webs can trap pollen, spores, and debris, significantly reducing the aesthetic quality of ornamental plants and harvestable vegetables. Furthermore, excessive webbing can clog equipment and interfere with the application of pesticides or beneficial insect releases, complicating integrated pest management (IPM) programs.

Control measures are centered on cultural and mechanical interventions to reduce the attractiveness of the environment to these spiders:

• Regular mechanical removal of webs and spider retreats from greenhouse frameworks.
• Maintenance of optimal airflow and humidity to discourage web construction.
• Sealing cracks in greenhouse structures to limit shelter availability.
• Targeted use of approved insecticides only when populations reach an unmanageable threshold.