Sometimes a combination of dust and spray treatments is more effective than either alone. When used with sprays, dusts should be applied after the spray has dried. Traps Trapping is an effective way to reduce cockroach populations, especially when used along with preventive and insecticidal measures. Trapping also can determine harborage areas and infestation severity, monitor effectiveness of chemical controls, and detect population increases which may require insecticide treatment. Several types of traps can be purchased.
Cockroaches detect the food odor, enter the trap, and become immobilized by the adhesive.
If no cockroaches are caught in a trap after two nights, change its location. Traps are particularly effective against brownbanded and German cockroaches. The number of traps required for a building will vary with the kind of cockroach present and the severity and location of the infestation. Traps are inexpensive, convenient to use, disposable, and contain no toxic insecticide. If a severe or widespread cockroach infestation occurs, or if you are in doubt as to proper control measures, employ a reputable pest exterminator.