German cockroaches are the roach that lives indoors. You won’t find them coming in from the yard; they live in kitchens and bathrooms, and in apartments and condos they move between units through shared walls, plumbing chases and electrical runs.
That is why one unit treating alone often doesn’t solve the problem, and why the right products matter more than how much gets sprayed.
How to identify a German cockroach
- About half an inch long as adults, light brown to tan.
- Two dark stripes running lengthwise behind the head.
- Found in kitchens and bathrooms: behind and under the stove, fridge and dishwasher, inside cabinet hinges, and around sinks.
- Mostly active at night. Seeing them during the day usually means a large population.
They are different from the big American cockroaches (palmetto bugs) in South Florida and the Turkestan roaches common in Las Vegas yards, which usually come in from outside.
Why they spread so fast
A female German cockroach carries an egg case with dozens of eggs until they are almost ready to hatch, which protects them from many treatments. In warm conditions, young roaches can reach adulthood in about two months. A few roaches brought in on a box, a used appliance or a grocery bag can become a building-wide problem.
In multi-unit buildings they travel along:
- Plumbing and gas line penetrations under sinks and behind appliances
- Electrical outlets and switch boxes on shared walls
- Trash chutes, trash rooms and laundry rooms
- Gaps under doors to hallways
Early signs
- Small dark specks like ground pepper in cabinet corners, hinges and drawers (droppings)
- Shed skins and empty egg cases
- A musty odor in heavy infestations
- Roaches running when you turn on the kitchen light at night
Why sprays often make it worse
Over-the-counter sprays and foggers kill the roaches they hit, but they also scatter the rest deeper into walls and into neighboring units, and they don’t reach the protected egg cases. Some products also contaminate baits, making roaches avoid them.
What works
- Gel baits placed in cracks and hinges where roaches live. Roaches feed and return to hiding, where the bait spreads through the population.
- Insect growth regulators that keep young roaches from developing into breeding adults.
- Follow-up visits every two to three weeks to catch newly hatched roaches until activity stops.
- Sanitation and sealing: wiping grease, storing food sealed, taking out trash nightly, fixing leaks and sealing gaps around pipes.
- Treating neighbors and common areas when roaches are moving between units.
For condo associations and property managers
The most effective approach in a building is to treat the affected unit, inspect units on either side and above and below, and treat trash rooms and common areas on a schedule. Swat It! provides recurring commercial and multi-unit pest control with service records for every visit, in both the Las Vegas Valley and South Florida.
Frequently asked questions
Can I get rid of German cockroaches myself?
Light activity can sometimes be handled with quality baits and good sanitation, but established infestations in apartments usually need professional baiting, growth regulators and follow-up visits.
Why do roaches keep coming back after I spray?
Sprays scatter roaches into walls and neighboring units and don’t affect egg cases, so the population rebounds. Baits and growth regulators work better.
How long does treatment take?
Most infestations drop sharply within one to two weeks, with follow-up visits over the next several weeks until activity stops.
Will my neighbors’ roaches come back into my unit?
They can. That is why treating adjoining units and common areas gives the best long-term results.
Seeing roaches? Call (702) 760-2906 in the Las Vegas Valley or (954) 231-5900 in South Florida, or see our cockroach control page.
