Combat Source Kill 4: Six Ant Bait Stations. Kills Queen & Entire Colony. Henkel 45901 - Set of 2 Most thorough active ingredient on the market for ant and roach baits. Non-detectable insect stomach poison that kills ants and kills roaches through ingestion. Slow-acting formula allows pests to return to their nest/colony before dying to poison other pests in the nest or colony. Highest secondary (nest/colony) kill. Kills ants and kills roaches in a domino effect eliminating the source of the infestation. Some pests die in the nest, where you will not see them.