kairomone

1. (biochemistry, ecology) Any substance produced by an individual of one species (often an insect) that benefits the recipient which is of a different species but is harmful to the producer.Examples: "Among these substances, we propose to designate two major functional groupings by the terms allomone and kairomone, chosen as intentional parallels to the term pheromone."; "Host‐finding by the parasitic wasp Orgilus lepidus, a braconid parasite, is mediated by two kairomones present in the frass of the host insect, the potato tuberworm."; "Mutillids apparently use odour signals (kairomones) while actively running in suitable locations for finding such hosts, and must spend much time searching, with little prospect of finding numerous hosts."