Prior to baiting, pre-treatment sampling was conducted in all test sites using ten glass jar traps, left for 48 hours in the food-preparation area. Each trap was baited with a piece of white bread soaked earlier in local beer. During the collection of traps, all cockroaches were counted. The cockroaches were then brought back to the laboratory, reared for 1 - 2 generations and the F1 - F2 generations were tested for their susceptibility to the baits and other com~nonly used insecticides. Cockroaches caught during pre-treatment were not released back into the population will not affect results of subsequent trappings. This is because German cockroaches have a very short life cycle (about 40 days) and this would allow ample time for population recovery.