Spider Control in Tarrant County: Identifying the Ones That Matter and How to Manage Them

The black widow is the more easily identified of the two. Females are shiny black with a distinctive red hourglass marking on the underside of the abdomen. They build irregular, low-to-the-ground webs in dark, undisturbed areas — garages, storage sheds, wood piles, outdoor furniture stored in sheds, behind outdoor electrical boxes, and under eaves. Males are smaller, less venomous, and more variable in appearance.

The brown recluse (Loxosceles reclusa) is tan to dark brown with a distinctive violin-shaped marking on the cephalothorax (the fused head and thorax). They are small — about 3/8 inch in body length — with six eyes arranged in pairs rather than the eight eyes most spiders have. Brown recluses are found indoors in dark, undisturbed areas: inside cardboard boxes in storage areas, in clothes that have not been worn for extended periods, under furniture, and inside shoes. They do not build visible webs for catching prey.

Black widows are overwhelmingly an outdoor and garage spider in Tarrant County. The most common locations are attached garages (especially along the wall where tools or storage items create harborage), outdoor storage sheds, under the lip of trash and recycling bins, under outdoor chairs and tables stored in the shade, and in rock walls or wood piles. They are much less commonly found inside the living areas of homes.

Brown recluses, by contrast, are a true indoor spider. They thrive in climate-controlled interiors and are frequently found in boxes and bags stored in closets and attics, in stacked clothing, under furniture that is rarely moved, in the corners of rooms with clutter, and between storage boxes. Homes with significant cardboard storage in closets or attics are at higher risk for established brown recluse populations.

Professional spider control in Tarrant County typically involves three components. First, web removal and knockdown of visible populations during the service visit. Second, application of a residual insecticide to the exterior perimeter, garage walls, and interior baseboards — targeting both spiders directly and the insect prey populations that attract them. Third, discussion of harborage reduction measures the homeowner can take to reduce favorable conditions.

Spider control is inherently tied to general insect population control. Spiders follow their prey, and a property with high general insect pressure will have higher spider populations. Effective general pest control — reducing ants, crickets, roaches, and other prey insects — indirectly reduces spider populations by eliminating their food source.

The most impactful non-chemical spider control measure is eliminating dark, undisturbed harborage areas. This means: storing clothing and seasonal items in sealed plastic bins rather than cardboard boxes, keeping garages free of clutter along walls, moving firewood away from the exterior of the structure, shaking out shoes and work gloves that have been stored, and reducing outdoor lighting that attracts the insects spiders prey upon.

Sticky traps (glue boards) placed along walls in garages and interior storage areas both capture and monitor for brown recluse activity. A significant number of brown recluses on traps confirms an established population and warrants professional treatment.

Black widow bites produce immediate sharp pain at the bite site followed by systemic symptoms including muscle cramps, abdominal pain, and sweating. If a black widow bite is suspected, seek medical attention promptly. Antivenin is available and effective when administered appropriately.

Brown recluse bites are often painless initially and may not be noticed for several hours. The bite site typically develops a blister surrounded by an expanding reddish-blue ring, and tissue necrosis can develop at the site. Seek medical evaluation promptly if you suspect a brown recluse bite, particularly if the wound shows signs of necrosis or systemic symptoms develop.