Male attraction to virgin females in the almond seed wasp, Eurytoma amygdali Enderlein (Hymenoptera, Eurytomidae).
Laboratory observations in Greece showed that adults of the almond pest Eurytoma amygdali were sexually mature on the day of emergence. In experiments with an olfactometer, virgin females 1-12 days old were found to attract males, apparently by means of a pheromone. The males were most responsive in the 1st part of the photophase. In the field, males were caught in traps of the Delta type suspended from almond trees and containing a cage with 5-20 virgin females. Traps containing mated females or empty cages were not attractive to males.