German cockroaches are the small fast ones that live inside, breeding behind the fridge, inside the dishwasher door, in the microwave hinge and along the kickboards. They arrive with cardboard boxes and second-hand appliances and move between townhouses through shared walls and plumbing. The big Australian and American cockroaches come in from drains and garden beds when it is hot or wet.
Inside we place gel bait where the roaches actually hide, which they eat and carry back to the harbourage, and we treat the voids and hinges where the egg cases sit so the job is not repeating in six weeks. No spraying the benchtops and no clearing the cupboards. For the outdoor species we treat drains, the slab edge and the base of the house.