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Host exploitation by parasitoids: local variations in foraging behaviour of females among populations of Trichogramma species

Using artificial patches of Ephestia kuehniella (Lepidoptera: Pyralidae) eggs, we compared two strains of Trichogramma cacoeciae Marchai and three strains of T. brassicae Bezdenko (Hymenoptera: Trichogrammatidae) for their strategies in colonizing hosts. The method by which females distribute their eggs among hosts was assessed either in terms of the average distance between parasitized hosts within a given patch, or of the average distance of attacks in discontinuous patches arranged in a circle.