The Brown Recluse, Loxosceles reclusa, has a reputation that far exceeds reality. It is a hunting spider that uses it web only for lining its retreat and for covering its eggs. It is very capable of biting humans, and the venom is a cyto-toxic venom which causes tissue death at the site of the bite, possibly leading to a large, infected, and lingering wound. However, experts believe that most skin infections blamed on this spider’s bite are actually bacterial infections, particularly in states with very high reported bites but very low confirmed presence of the spider. The Brown Recluse lives commonly in structures, hiding with clothing, behind furnishings, or in attics and wall voids. Young spiders take about one year to mature and the adults live about one year more. They prefer to remain in areas of low activity and are not aggressive, biting only when provoked to do so by becoming trapped and threatened with harm.
General cleanup of unnecessary debris outside will reduce harborage sites, and cleanup of clutter in garages or storage areas will reduce the numbers of spiders living on the interior. If invading spiders become a problem they can be prevented with an application of a residual pyrethroid insecticide around the building exterior and in likely pathways along walls on the inside. The use of glue traps can confirm the presence of the spiders, placed in attics or along wall-floor junctions. Dust formulations can be injected into walls or other voids the spiders may inhabit. Since structures can be re-infested from surrounding areas the habitat of this spider should be pushed as far away from the structure as possible. Heavy vegetation cover on the ground should be kept away from the structure, and all debris and materials on the soil that do not have to be there should be eliminated. Trees and shrubs that grow near the structure should be physically separated by pruning, and all cracks or other openings to the structure that can be repaired should be permanently sealed.