Black Widow Spider
Latrodectus spp.
Black widow spiders are shiny black spiders with a distinctive red hourglass marking on the underside of their round abdomen. Females measure 1.5 inches including legs, while males are much smaller. These venomous spiders build irregular, tangled webs close to the ground. Only female black widows have medically significant venom.
Habitat & Behavior
Black widows prefer dark, undisturbed areas and build webs close to the ground in protected locations. Common outdoor sites include woodpiles, rock piles, under deck boards, in meter boxes, around foundations, and in outbuildings. Indoors, they inhabit garages, crawl spaces, basements, closets, and storage areas. They're most active at night and rarely venture far from their webs.
Signs of Infestation
- Irregular, tangled cobwebs in corners, near ground level, or in cluttered areas
- Shiny black spider with red hourglass marking visible on abdomen
- Small, papery egg sacs within the web, each containing hundreds of eggs
- Webs containing trapped insects and debris
- Multiple webs in protected outdoor structures like sheds and garages
Health & Property Risks
Black widow venom is neurotoxic and one of the most potent spider venoms affecting humans. Bites cause severe pain, muscle cramps, nausea, and difficulty breathing, requiring immediate medical attention. While deaths are rare due to antivenom availability, bites pose serious risks to children, elderly, and those with compromised immune systems. Black widows are not aggressive and only bite when threatened or accidentally pressed against skin.
Prevention Tips
- Wear gloves when working in garages, sheds, woodpiles, or storage areas
- Remove clutter and debris where spiders can hide and build webs
- Shake out shoes, gloves, and clothing stored in garages or closets
- Seal cracks and gaps around foundations, doors, and windows
- Store firewood away from your home and off the ground
- Use caution when reaching into dark, undisturbed areas
Professional Treatment Approach
Greenix's black widow control includes thorough inspection of potential harborage areas followed by targeted web removal and treatment. We apply residual insecticides to areas where black widows live and hunt, including foundations, crawl spaces, garages, and outdoor structures. Our technicians use specialized equipment to treat hard-to-reach areas and remove webs and egg sacs. We provide guidance on reducing clutter and eliminating conditions that attract these dangerous spiders.
Related Pests
Other common spiders you might encounter
Brown Recluse Spider
Brown recluse spiders are tan to dark brown with a distinctive dark violin-shaped marking on their back. They measure 1/4 to 1/2 inch in body length with legs extending total size to about 1 inch. Unlike most spiders which have eight eyes, brown recluses have six eyes arranged in pairs. These shy, reclusive spiders avoid human contact.
Common House Spider
Common house spiders are yellowish-brown to gray spiders measuring 3/16 to 5/16 inch in body length with distinctive dark chevron markings on their abdomens. They build irregular, tangled cobwebs in corners, along ceilings, and in undisturbed areas. These harmless spiders are the most frequently encountered spider species in homes.
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