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.
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 Photo
Use this photo to confirm your identification. Click to enlarge. Correct ID is the essential first step to effective treatment.
American cockroach (Periplaneta americana) — reddish-brown, 1.5–2 inches; yellowish figure-8 on head; the largest common US cockroach
📷 Wikipedia / Wikimedia Commons / CC BY-SA⚠️ Photo loaded live from Wikipedia/Wikimedia Commons (CC BY-SA). Appearance varies by region, age, and sex. When uncertain, contact a licensed pest professional.
American vs. German Cockroach — Critical Differences
This distinction matters enormously for treatment. Seeing a German cockroach means you have an established interior infestation requiring aggressive gel bait treatment. Seeing an American cockroach — especially one that scurried in from outside or emerged from a drain — is much less alarming. It's a wanderer, not a resident.
American cockroaches commonly enter through floor drains, sewer connections, and gaps around pipe penetrations in the floor. If you're seeing them in bathrooms or basements, check drain seals and the gap around any pipe that goes through the floor. They follow moisture plumes from sewers upward into structures.
Control Strategy
Exclusion first: Seal all floor drain gaps, gaps around pipe penetrations, and floor-level utility entry points. Install floor drain covers. This is 80% of the solution for most American cockroach problems.
Perimeter spray: Apply bifenthrin along the foundation perimeter, around crawlspace vents, and near any drainage areas. This kills wandering adults before they find entry points.
Bait stations: Place cockroach bait stations in garages, crawlspaces, and basements where American roaches harbor. Advion gel bait works on American roaches as well as German roaches.
Moisture reduction: Fix any standing water near the foundation, repair dripping outdoor faucets, and ensure gutters divert water away. American roaches follow moisture gradients.
American cockroach infestations rarely reach the scale of German cockroach infestations because they cannot reproduce as rapidly indoors. Consistent perimeter treatment and exclusion work effectively. You are unlikely to need professional help unless the problem is severe or involves major sewer infrastructure issues.
Identification — The Violin and Six Eyes
Brown recluse spiders have two key identification features. First, the violin marking on the cephalothorax (head region) — a dark violin-shape pointing toward the abdomen. This is reliable but requires close inspection. Second, and more definitive: brown recluses have six eyes arranged in pairs rather than eight eyes in two rows like most spiders. Under magnification this is unmistakable.
Overall appearance: 1/4 to 3/4 inch body, long thin legs, light to medium brown coloring, no banding or markings on legs. Their movement is distinctive — slow and deliberate rather than fast-darting like wolf spiders.
Most brown recluse bites occur when spiders are accidentally trapped against skin (rolling over on one in bed, dressing in stored clothing). The spider bites defensively only. About 10% of bites cause necrotic wounds requiring medical attention; the remainder resolve with minor localized symptoms. Seek medical care for any bite that doesn't improve within 24 hours or develops expanding discoloration.
Distribution — Are They in Your State?
Brown recluses have a specific U.S. range: the Midwest and South — Missouri, Kansas, Arkansas, Oklahoma, Texas, Louisiana, Mississippi, Alabama, Tennessee, Kentucky, Georgia, and parts of Nebraska and Iowa. They are NOT established in most of the Eastern Seaboard, Pacific Coast, or northern states. Many supposed brown recluse identifications outside this range are other spider species. If you're in a non-endemic state, consult an entomologist before assuming brown recluse.
Control — Desiccants, Glue Boards & Habitat
CimeXa dust: Apply in all wall voids, under insulation, in crawlspaces, and along baseboards in storage areas. Brown recluses traveling through CimeXa-treated areas die from cuticle dehydration. Because spiders don't groom like insects, boric acid is far less effective — desiccants are the right chemistry.
Glue board trapping: Brown recluse glue boards placed flat in corners, along walls, under appliances, and in storage areas capture significant numbers and — crucially — reveal how many spiders are actually present. One study found homes with hundreds of brown recluses unknowingly coexisting with the family. Monitoring gives you real data.
Reduce harborage: Brown recluses love undisturbed spaces with cardboard, clutter, and stored items. Clear clutter from closets, use plastic storage bins instead of cardboard boxes, and eliminate undisturbed dark spaces. Shake out clothing stored in closets before wearing — especially in endemic areas.
Brown recluses are strongly attracted to corrugated cardboard — it mimics the bark crevices they evolved to inhabit outdoors. Eliminating cardboard boxes in closets, garages, and basements dramatically reduces brown recluse harborage. Replace with plastic totes.