Spider Control in Marble Falls: Black Widows, Brown Recluses, and What to Do About Them

The Southern black widow is widespread throughout the Hill Country and one of the easiest spiders to identify. The adult female is jet black, roughly 1/2 inch in body length, with a red hourglass on the underside of her abdomen. Males and young spiders look different: they can have orange, red and white markings, and adult males are much smaller.

Black widows in Marble Falls favor dry, sheltered, low-traffic areas: the underside of deck boards and outdoor furniture, inside utility boxes and water meter covers, in stone walls and rock piles, under plant pots and landscape timbers, and in garage corners near the floor. They build disorganized, strong, low webs, often right at ground level, rather than the geometric orb webs people picture when they think of spiders. A ragged, tangled web in a corner of your garage or near the foundation is a common first sign of black widow presence.

Brown recluses are harder to identify and more likely to show up in your living spaces than black widows. Adults are medium brown with a violin-shaped marking on the front body segment, pointing toward the abdomen. You need good light and a close look to see it clearly, though. They also have six eyes in three pairs, not eight eyes in two rows like most other spiders. That detail matters for confirming an ID, because a lot of harmless brown spiders get misidentified as recluses.

Brown recluses are found throughout Texas, and the Hill Country is well within their established range. Indoors, they concentrate in undisturbed areas: inside cardboard boxes that have been stored for months, in clothing not recently worn, between stacked items in closets, behind wall hangings and baseboards, and in crawl spaces. They are nocturnal hunters and are most active at night. Most bites occur when a spider is inadvertently pressed against skin inside clothing or bedding.

The most effective long-term spider control strategy is eliminating the harborage and prey that sustain populations. For exterior areas, this means moving firewood away from the structure, clearing leaf litter and organic debris from the base of retaining walls and foundation plantings, and not letting outdoor storage items (flower pots, yard equipment, children's toys) sit undisturbed for long stretches. In the Hill Country, limestone retaining walls and boulder landscaping provide abundant natural harborage that is difficult to eliminate entirely. Keeping the strip immediately next to the structure clear is what reduces the chance of spiders establishing inside.

For interior black widow and brown recluse populations, the most impactful steps are reducing clutter in garages and storage areas, using sealed plastic bins instead of cardboard boxes for stored items, and sealing gaps around baseboards, pipes, and electrical conduit where spiders enter from wall voids. Shake clothing and shoes that have been stored unused before wearing, particularly items left in garages or outdoor storage closets during warmer months.

Professional spider control in a home focuses on perimeter residual treatment and targeted applications in harborage areas, not whole-house spraying. Residual insecticides applied along the exterior foundation, beneath deck framing, around utility penetrations, and inside garage corners kill spiders on contact and intercept the ones moving from outdoor harborage toward the interior. Web removal at the time of treatment is standard, because it disrupts established territories and clears out egg sacs.

Serious indoor brown recluse infestations can get large in older Hill Country homes with many wall void entry points. For those, sticky monitoring traps placed in corners, behind appliances, and in closets do two jobs: they gauge how dense the population is and they keep knocking it down over time. Brown recluse infestations often take multiple service visits and structural exclusion work to fully resolve, especially in homes with pier-and-beam construction or multiple crawl space entry points.

Texas A&M describes a black widow bite as feeling like a pinprick at first, if it is noticed at all. The reaction can spread through the body, with pain that becomes intense in 1 to 3 hours and can last up to 48 hours, along with tremors, nausea, vomiting, leg cramps and abdominal pain. Get medical care after a suspected black widow bite.

Texas A&M AgriLife says brown recluse bites may swell and can break down tissue around the bite, but are typically like any normal wound. The CDC notes the venom can cause a severe lesion by destroying skin tissue, and that such a lesion needs professional medical attention. Get any serious reaction, or a wound that is not healing properly, looked at. AgriLife also points out that other conditions, such as antibiotic-resistant staph infections, can look like spider bites.