Cockroaches are among the most resilient pests in South Africa — and among the best at hiding. By the time you see one during the day, the infestation may already be well established. Knowing the early warning signs can save you from costly damage and serious health risks.

Why Cockroaches Are Hard to Detect

German cockroaches and American cockroaches — the two species most common in SA homes — are nocturnal. They prefer warm, humid areas near food and water: kitchens, bathrooms, behind appliances, and inside cupboards. A single female German cockroach can produce hundreds of offspring per year, so populations grow fast once they take hold.

10 Warning Signs to Watch For

  1. Live cockroaches during daylight — Seeing roaches in the open, especially in daylight, usually means overcrowding has forced them out of hiding.
  2. Droppings — Small, dark specks resembling ground pepper or coffee grounds, often found along skirting boards, inside drawers, or behind the fridge.
  3. Egg cases (oothecae) — Brown, purse-shaped capsules about 8–10 mm long, hidden in cracks, behind furniture, or inside cardboard boxes.
  4. Unusual musty odour — A persistent oily, musty smell in kitchens or cupboards can indicate a large colony.
  5. Smear marks — Greasy brown streaks along walls and horizontal surfaces where roaches travel regularly.
  6. Shed skins — Cockroaches moult 5–8 times before adulthood, leaving behind translucent shell casings.
  7. Chewed packaging — Holes or gnaw marks on food boxes, especially in pantries and storage areas.
  8. Noises at night — A faint rustling or scuttling sound behind walls or inside cupboards after dark.
  9. Allergies or asthma flare-ups — Cockroach allergens in droppings and shed skins are a known trigger, especially in children.
  10. Neighbours with infestations — In flats and townhouses, cockroaches travel through shared plumbing and wall voids.
Quick check Inspect behind your refrigerator, under the sink, and inside the grease trap area of your stove tonight with a torch. These three spots account for most first-time discoveries.

What You Can Do Right Now

Start with sanitation: wipe down surfaces, store food in sealed containers, empty bins daily, and fix any leaking taps. Reduce clutter in kitchens and bathrooms so there are fewer hiding places. Avoid leaving pet food out overnight.

DIY sprays and supermarket baits may kill visible roaches but rarely reach the nest. German cockroaches in particular develop resistance to common over-the-counter products, which is why professional gel baiting and targeted treatments are far more effective.

When to Call a Professional

Contact a licensed pest control company if you see multiple roaches, find egg cases, notice a persistent odour, or if DIY methods haven't worked within a week. Early professional treatment is almost always cheaper than dealing with a full-blown infestation that has spread to multiple rooms.

At Aplus Pest Control, our technicians use SAPCA-approved gel baits and residual treatments that target the colony — not just the roaches you can see. We also identify entry points and harbourage areas to prevent reinfestation.

"If you spot one cockroach in your kitchen at night, assume there are more you haven't seen. Acting within 48 hours makes a huge difference." — Aplus Senior Technician
Cockroaches Prevention Home Safety South Africa