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Black widow spiders (Latrodectus) are the most-medically-significant spider in Florida. Bites can require medical attention. Here is the identification, prevention, and treatment guide.
How to identify black widow
- Glossy black body, 1/2 inch body length (1.5 inch leg span).
- Distinctive red hourglass marking on UNDERSIDE of abdomen.
- Females are the dangerous ones; males rarely bite.
- Builds messy, irregular webs in dark protected spots.
Where black widows live in Florida
- Outdoor sheds, garages, woodpiles.
- Under outdoor furniture.
- In old debris, tires, buckets.
- Crawlspaces and cluttered storage.
- Near electrical boxes and meter readers.
- Rarely venture indoors.
What a bite feels like
- Sharp pain at bite site, often described as pinprick.
- Within 1 hour: severe muscle cramps, especially in abdomen.
- Sweating, nausea, elevated blood pressure.
- Symptoms peak 12-24 hours after bite.
- Most healthy adults recover in 2-3 days even without antivenom.
- Children and elderly at higher risk for severe reactions.
If bitten
- Wash bite area with soap and water.
- Apply ice to reduce swelling.
- Seek medical attention immediately for children, elderly, or anyone with severe symptoms.
- Capture spider in jar if safely possible (helps medical identification).
- Do NOT cut or suck out the bite — increases infection risk.
Treatment and prevention
Wear gloves when handling outdoor materials
Especially when moving woodpiles, cleaning sheds, or reaching into stored items.
Spray Bifen IT in known areas
Treat sheds, garages, woodpiles, and outdoor furniture undersides quarterly.
Eliminate clutter and webs
Remove webs you find. Discourage rebuilding by treating area with Bifen IT.
Diatomaceous earth in sheds and crawlspaces
Apply DE in spider-prone areas where chemical sprays may not be ideal.
Verdict
Black widows are present in Florida but rarely venture indoors. Wear gloves outdoors, treat sheds and garages with Bifen IT quarterly, and seek medical attention for any suspected bite. Children and elderly require immediate medical evaluation if bitten.
Reminder: Always read product labels and follow manufacturer safety instructions. For dangerous pests or large infestations, hire a licensed professional.