The acceptance and suitability of three aphid species [Aphis gossypii Glover, Aphis craccivora and Rhopalosiphum maidis (Fitch)] (Homoptera: Aphididae)for the parasitoid Aphidius colemani Viereck (Hymenoptera: Aphidiidae) were studied and evaluated. Parasitoid female parasitizedfewer R. maidis than the other two aphid species. Also, fewer offspring successfully completeddevelopment in R. maidis than in the other two host species, suggesting that R. maidis is a poorquality host for the mentioned parasitoid. No significant differences in sex ratios of emerging parasitoid adults between A. colemani reared on the three aphid species. Ovipositing A. colemani encountered R. maidis at aslower rate, also, parasitoid offspring died at a higher rate in R. maidis compared to A. gossypii. The results showed that oviposition behavior and offspring performancewere correlated. The results of this research can be used for establishing integrated pest management (IPM) strategies against aphid species.