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An investigation of host associations, distribution and types of reproduction  (sexual, asexual) of Lysiphlebus fabarum (Marshall) across 20 provinces of  Iran during 2006-2011 was undertaken. The parasitoid was reared from three  groups of host aphids belonging to genera Aphis and Brachycaudus, and  occasional host aphid genera. Aphis craccivora Koch was the most frequent  host aphid for L. fabarum on various host plants, including economically  important crops. The field sex ratio generally favored females, but in some  cases, only thelytokous (uniparental) populations were found. In those cases,  the host was always an Aphis species. Specimens reared from Brachycaudus  aphids were all biparental, indicating the presence of a sibling biological  species. Overall analysis of diagnostic morphological characters in the  forewing indicated intra-specific variability in forewing marginal setae as  well as variations in length of the R1 vein. [Projekat Ministarstva nauke  Republike Srbije, br. 43001

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Tritrophic associations and taxonomic notes on Lysiphlebus fabarum (Marshall) (Hymenoptera: Braconidae: Aphidiinae), a keystone aphid parasitoid in Iran