Aphidius eadyi n. sp., a parasitoid of Acyrthosiphon pisum in the west Palearctic is described. Its distribution and interspecific relations (crossing experiments) to a related species, Aphidius smithi, are elucidated. The new species has been found to be a promising agent in biocontrol of the pea aphid, Acyrthosiphon pisum, whereas it does not parasitize the blue alfalfa aphid, A. kondoi.
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