Venomous Spiders in the Upstate
South Carolina is home to two medically significant spider species, and both are common in the Greer area. The brown recluse builds irregular webs in undisturbed indoor spaces — closets, boxes, behind picture frames, inside rarely-worn shoes. The southern black widow prefers dark, low-traffic outdoor and indoor spaces — crawl spaces, garage corners, meter boxes, and stacked firewood.
Brown recluse populations have been growing across the Upstate over the past decade, likely aided by climate change extending warm seasons and by the rapid construction of new homes that create harborage opportunities. Recluse bites cause necrotic tissue damage that can require medical intervention and leave scarring.
Common Harmless Spiders You'll See
- Wolf spiders — Large, hairy, fast-moving ground hunters. Alarming to find but not dangerous. They don't build webs — they chase down prey. Common in garages, basements, and ground-level rooms.
- Cellar spiders (daddy long-legs) — Delicate spiders with extremely long legs, found in corners and basements. They actually prey on other spiders, including brown recluses.
- Orb weavers — Build the classic wheel-shaped webs on porches, around exterior lights, and between bushes. They're beneficial pest controllers but can create unsightly web accumulations.
- Joro spiders — The large, colorful invasive species from Asia that's been spreading across the Southeast. Now established in the Upstate. Their massive golden webs span between trees and structures. Harmless to humans despite their intimidating size.
Reducing Spider Populations
Spiders follow their food. A home full of spiders is a home full of insects — flies, gnats, moths, and other prey species that web-building spiders depend on. Treating the underlying insect problem is half the battle.
For direct spider control, we apply residual treatments to web-building sites, entry points (window frames, door casings, eave areas), and known harborage zones. We physically remove existing webs and egg sacs — a single egg sac can contain 100–300 developing spiderlings that would hatch within weeks.
For brown recluse concerns, we deploy sticky monitoring traps in closets, attics, and storage areas to assess population levels and track treatment effectiveness over time. Recluse elimination requires patience — they avoid treated surfaces better than most pests, and populations decline gradually over weeks rather than days.