Russian wheat aphid, Diuraphis noxia, is one of the economic pests of small grain cereals with worldwide distribution. In current research, susceptibility of D. noxia to a number of host plants including two cultivars of wheat (cv. Shiroodi and Gascogne ) and triticale (cv. Sanabad and Juanillo 92) were evaluated under greenhouse conditions (23 ± 5°C, 60 ± 10% RH and the photoperiod cycle of 16L:8D). The parameters of fertility life table were determined using age-stage two-sex life table theory. The highest developmental time belonged to cv. Sanabad population with a mean value of 11.6 ± 0.21 days and the lowest to cv. Shiroodi population with a mean value of 7.29 ± 0.19 days. The aphids reared on Shiroodi and Juanillo 92 cultivars with mean values of 47.45 ± 2.86 and 12.85 ± 3.13 represented the highest and lowest numbers of offspring, respectively. The intrinsic rate of increase varied from 0.25 female/female/day in aphids reared on cv. Shiroodi to 0.11 ± 0.01 female/female/day in those reared on cv. Juanillo 92. Mean generation time for aphids ranged from 14.2 ± 0.07 days on cv. Shiroodi to 19.99 ± 0.07 days on cv. Juanillo 92. According to the results, Shiroodi and Juanillo 92 cultivars exerted the lowest and highest antibiosis effects on D. noxia population, respectively.

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