Aphid Alarm Pheromones: Dispersion of Hyadaphis erysimi and Myzus persicae1,2

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Abstract
Clusters of the turnip aphid, Hyadaphis erysimi (Kaltenbach), and green peach aphid, Myzus persicae (Sulzer), feeding on turnip leaves, were exposed to alarm pheromone from cornicle droplets. Aphids dispersed by walking or falling, both responses occurring about equally. The proportion of aphids dispersing by falling decreased with increase in distance of the pheromone source. Aphids that responded to pheromone by walking usually resettled on the same leaf. Redistribution of aphids to other leaves on the plant was attributable almost entirely to the return of aphids which had fallen off the host plant. No preference was exhibited by returning aphids for or against the leaf on which the cluster was originally located.

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