Black Widow Spider

Look for females about 1/2 inch (body length) with long legs spread around a tangle web. Typical signs include the classic red hourglass on the belly, one-inch–wide tangled cobwebs in corners, garages, woodpiles, crawlspaces, and 1/2–3/4″ white egg sacs. Use a flashlight at night—black widows are often active after dusk.

Visible tangled webs in corners and under ledges, multiple egg sacs (small, white, spherical), adult sightings in garages/attics/crawlspaces, increased sightings in late summer when juveniles disperse, and occasional accidental encounters in laundry piles or shoes.

Professionals start with a thorough inspection of the structure and property to locate webs, egg sacs and harborage sites. Treatment typically includes targeted removal of webs and egg sacs, dusting of wall voids and under eaves with desiccant or residual dusts, perimeter residual insecticide treatments where allowed, sealing and exclusion of entry points, and recommendations for habitat modification (woodpile relocation, debris removal, reducing clutter). Monitoring traps may be installed in garages and crawlspaces. Technicians use equipment and PPE to remove spiders safely and will advise immediate medical attention if a bite occurs.

Keep firewood and brush piles 20–30 feet from foundations and off the ground; seal cracks around foundations, window wells and eaves with caulk or mesh; install door sweeps and repair screens; reduce clutter in garages, basements and attics; store outdoor furniture and clothing in sealed containers; use yellow outdoor lighting or move lights away from doors to reduce insect attraction. Regularly clear spider webs from porches and under rooflines. Wear gloves and shake out stored items before handling.

Dark, protected microhabitats: woodpiles, rock walls, stacked lumber, window wells, garages, basements, crawlspaces, sheds, under eaves and inside seldom-used furniture or boxes. In Asheville, the combination of shaded yards, stone retaining walls and historic houses with gaps creates ideal sites.

Black widows are present across Western North Carolina and are particularly well suited to the humid subtropical climate with cool mountain influence around Asheville. They favor the region's mix of single-family homes, mountain cabins and older Craftsman homes with abundant sheltered nooks. Prevalence note: {prevalence_note}