Original illustration by PestControlBasics.com. Use anatomical labels above to confirm your identification.
Original illustration by PestControlBasics.com. Use anatomical labels above to confirm your identification.
Original illustration by PestControlBasics.com. Use anatomical labels above to confirm your identification.
Original illustration by PestControlBasics.com. Use anatomical labels above to confirm your identification.
🔍 Identification
Female: 7-10mm body; brown (variable — tan to almost black); orange-yellow hourglass on abdomen underside (hourglass is less distinctive than black widow's red). Egg sac: spiky, white, with characteristic pointed projections — completely distinctive and unlike the smooth egg sacs of black widows. Males: smaller, patterned. Found in similar locations to black widows but adapts more readily to urban environments — under patio furniture, in plant pots, in mailboxes.
🧬 Biology & Behavior
Introduced from Africa (exact origin uncertain), now established in Florida, California, Texas, Louisiana, Georgia, and spreading northward. Actively displaces black widows from urban areas — studies show brown widow presence correlates with reduced black widow density. Less venomous than black widow — venom is approximately half as potent. Bites are medically significant but rarely require antivenin in healthy adults.
⚠️ Damage & Health Risk
Venomous bite causing localized pain and possible systemic symptoms (less severe than black widow); psychological concern; egg sacs in commonly-used outdoor furniture create unexpected encounter risk.
🔧 DIY Treatment
Monthly bifenthrin perimeter spray reduces populations. Remove egg sacs (gloved hands, dispose in sealed bag) — the distinctive spiky sacs make targeted removal straightforward. Check under outdoor furniture and plant pots regularly. Remove debris and harborage near outdoor living areas.
👷 When to Call a Pro
Rarely warranted — perimeter spray is adequate management.