Identification
Brown widow spiders are light brown to tan with an orange or yellow hourglass marking on the underside of their abdomen. They have a mottled pattern on their legs and body, and their egg sacs are spiky, unlike the smooth sacs of black widows. Adults measure about 1 to 1.5 inches in length, including their legs.
Lifecycle & Reproduction
Brown widow spiders undergo incomplete metamorphosis, progressing from egg to spiderling to adult. Females lay egg sacs containing 120 to 150 eggs, which hatch in about 14 to 21 days. Spiderlings go through multiple molts before reaching maturity in about 4 to 6 months. Females live up to two years, while males have a much shorter lifespan.
Habits, Diet & Behavior
Brown widows are nocturnal and spin irregular, tangled webs in sheltered locations. They primarily feed on insects such as flies, mosquitoes, and beetles. Brown widows are less aggressive than black widows but will bite if disturbed. Their venom is less potent than that of black widows but can still cause mild to moderate reactions.
Where You’ll Find Them / Typical Locations
Brown widow spiders prefer quiet, undisturbed locations, including:
- Under eaves, railings, and patio furniture
- In mailboxes, storage bins, and trash cans
- Around window sills and door frames
- Inside garages, sheds, and outdoor play equipment
- Beneath logs, debris, and garden ornaments
Threats & Danger
Brown widow spider bites can cause localized pain, swelling, and redness. While their venom is less potent than black widows, sensitive individuals may experience muscle cramps or allergic reactions. They are considered nuisance pests due to their rapid reproduction and tendency to inhabit human dwellings.
Prevention
- Seal cracks and gaps around windows, doors, and foundations
- Remove clutter and debris where spiders may hide
- Shake out shoes, gloves, and stored items before use
- Keep outdoor furniture and structures clean and free of webs
- Use yellow outdoor lighting to reduce insect attraction
Signs of Infestation
- Presence of messy, irregular webs in sheltered locations
- Sightings of brown spiders with an orange hourglass marking
- Spiky, off-white egg sacs attached to structures
- Increased insect activity near nesting sites
- Bites resulting in mild pain or irritation
How to Get Rid of It
- Remove webs and egg sacs using a vacuum or broom
- Apply residual insecticides to known hiding spots
- Use glue traps to monitor and control spider activity indoors
- Reduce insect populations to limit food sources
- Seek professional pest control for large infestations