Some nematode species are parasitic on insects and can be used to control insect pests. Several nematode-containing products are available for outdoor flea control. The nematodes carry bacteria that kill the fleas but don't harm people or pets. Fungi that kill insects but don't hurt people are also used as biological control agents in indoor settings. One of the newest types of cockroach bait station contains a species of fungus normally found in soil.
Bacteria are yet another type of microbial control agent.
One of the most commonly employed is Bacillus thuringiensis or Bt. Bt is widely used in agriculture to control a variety of pests. A strain of Bt that is effective in killing ants is now being developed and should be available soon. Bait Stations Bait stations offer several advantages over other forms of insecticide. Bait stations deliver an insecticide through a sealed plastic or metal chamber that insects enter.