Scientific name: Latrodectus geometricus Family: Theridiidae Order: Araneae Risk level: High Category: Crawling pests
? What is a brown widow
The brown widow (Latrodectus geometricus) is an invasive spider that has spread worldwide and has replaced the black widow in some areas. It is beige-brown, with a purple/orange pattern on the abdomen and an orange (not red) hourglass mark. Its venom is less dangerous than that of the black widow.
Brown widow life cycle
Its life cycle progresses from egg to spiderling to adult. Depending on the species, an adult spider may live 1–3 years. Females are larger than males in most venomous species.
Where brown widows occur
They occur in many regions. Dangerous species are found in the Gulf, Saudi Arabia, Egypt and North Africa.
Damage and risks associated with brown widows
Latrodectism is milder than with the black widow: muscle pain, localized cramps and a mild systemic syndrome.
Signs of brown widows
Look for webs in corners and cracks, white egg sacs, or adult spiders in the dark or when moving furniture.
Where brown widows are found
They occur in gardens, around buildings, in wall cavities and beneath outdoor furniture. They are more common in warm urban areas.
Brown widow control methods
Conduct careful visual inspections, use UV light to detect webs, place sticky traps, clean thoroughly and seal cracks.
Brown widow control products
Apply pyrethroids where spiders are present. Use diatomaceous earth dust in cracks. Seal gaps and cracks.
Food-facility control requirements
FSSC/BRCGS: venomous spiders are an occupational safety risk. The control program must be documented.
A fact about brown widows
Brown widows lay distinctive hairy, spiky egg sacs, unlike the smooth sacs of black widows. This small difference allows inspectors to distinguish the two without examining an adult spider.
Frequently asked questions
Q: Are brown widows dangerous?
A: Their risk level is high. Their effects are milder than those of black widows and include muscle pain, localized cramps and a mild systemic syndrome. Avoid approaching one and contact a specialist immediately.
Q: What should I do after a spider bite?
A: Go to the emergency department immediately in cases involving venomous species. Keep the spider for identification if possible. Do not press on the bite
