Containerized and paste or gel baits should be the standard insecticide treatment for cockroaches in many buildings. The small, plastic bait containers should be placed as close as possible to harborage sites where the cockroaches are actually living. Place the bait stations behind refrigerators, in cabinets and along edges of walls and in corners. Do not place them where students can find them. Paste and gel baits are most effective when applied in small dabs.
Baits are most effective when the cockroach population is low or moderate in size.
If there is a large population, the bait in the stations may be entirely eaten before the cockroaches are eliminated. Bait stations should not be contaminated by sprays or dusts that may be repellant. When a moderate to large cockroach population is present, crack and crevice insecticide application is sometimes the most practical and effective way to apply insecticides. Use a narrow diameter extension tube in infested cracks and crevices to provide a thorough application of residual insecticide. Treat cracks and crevices under furniture, drawers, sinks, around pipes and in high cabinets.