Roach control by Bulwark Exterminating

The roaches collectively would spend more time and in greater numbers at one pile of food over another. Even more interesting–at least to cockroach researchers–the bugs would linger longer at the dining source if other roaches were there, too. ..

Link:
Cockroaches are collective food critics « Complete Idiot's Blog …

Designed as an integral pest management (IPM) tool for PCOs, this pheromone trap is the only trapping device available to PCOs that contains a natural German cockroach pheromone attractant. … The trap’s slippery silicone sides make it virtually i mpossible for cockroaches to escape.

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ROACH PHEROMONE TRAPS (M330) | Data Entry Employment