Preferred term

pheromone

Is replaced by

[Henderson's] n. a chemical released in minute amounts by one organism which is detected and acts as a signal to another member of the same species. Examples are the volatile sexual attractants released by some female insects, which can attract males from a distance. Some pheromones act as alarm signals.

http://vocabs.lter-europe.net/EnvThes/USLterCV_414