Alarm Pheromone Responses Depend on Genotype, but Not on the Presence of Facultative Endosymbionts in the Pea Aphid .

Aphids use an alarm pheromone, E-β farnesene (EBF), to warn conspecifics of potential danger. The antennal sensitivity and behavioural escape responses to EBF can be influenced by different factors. In the pea aphid, different biotypes are adapted to different legume species, and within each biotype, different genotypes exist, which can carry or not , a bacterial symbiont that can confer protection against natural enemies.