Abstract: (E)-β-farnesene is a main component of aphid alarm pheromone. The sensory part of an antennae of Myzus persicae to (E)-β-farnesene is located in the primary rhinaria as shown by cutting antennae experiment. The results of olfactory test showed that (E)-βfarnesene was very effective in repelling Myzus persicae and the capability of response to(E)-βfarnesene in the adult Myzus periscae is stronger than that in the young ones by EAGtest.

Key words: Myzus persicae, alarm pheromone, (E) -β-farnesene, antennae, behaviour re- spouse, electophysiological response