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. These professionals have the materials and training to do a thorough job. All insecticides are poisonous. They always must be handled carefully to minimize the possibility of harm to humans and animals by direct contact or through contamination of food and water. The key to safety is a knowledge of the hazards involved in handling and applying insecticides.