letter no. 1
Is gel or spray better for cockroaches?
the desk replies — For German cockroaches in kitchens, gel bait is usually superior: it poisons the whole colony, needs no evacuation and keeps working for weeks. Sprays suit American cockroaches entering from drains and perimeters. A good technician inspects first and typically combines both, and may add an insect growth regulator to stop the population rebounding.