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If you leave the spray and let it dry, it will keep killing cockroaches with residual action for up to six months as long as the bugs come in contact with it.
Also question is, how long does it take for roaches to die after spraying?
Don't stress if you do see bugs after treatment, some of them, especially cockroaches will survive the treatment, or will take a week or two to die. The good thing is that the poison that is sprayed is also still working, so with time, your problem should be eliminated.
Also question is, do roaches come out more after spraying?
Roaches may be more active after treatment, DO NOT SPRAY, your technician installed baits and household sprays will contaminate them. Expect to see more roaches for two weeks. As roaches are affected by the treatment they will come out in the daytime.
How to Get Rid of Roaches
- Identify the problem and seek professional help if you need it. Out of over 4,000 cockroach species in the world, most Americans encounter only one or two types: German cockroaches and American cockroaches.
- Cut them off from food.
- Eliminate their hiding places.
- Put out bait — but don't spray.
- Seal up entry points.