An analysis of host searching behaviour suggests that female parasitoids respond to aphid odours bringing them to the region of an aphid colony. Syrphid hosts are located within the aphid colony by response to contact chemicals on the larval integument. The behavioural mechanisms used by syrphid larvae to resist attacks and the subsequent responses made by parasitoids are described. Oviposition behaviour and host size preferences of parasitoids are described.
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Graham E. Rotheray (1981) studied this question.
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