kairomone

noun

1. 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.

   “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.”