The impact of host plant on biological parameters of Diuraphis noxia

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 ۹۲) were evaluated under greenhouse conditions (۲۳ ± ۵°C, ۶۰ ± ۱۰% RH and the photoperiod cycle of ۱۶L:۸D). 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 ۱۱.۶ ± ۰.۲۱ days and the lowest to cv. Shiroodi population with a mean value of ۷.۲۹ ± ۰.۱۹ days. The aphids reared on Shiroodi and Juanillo ۹۲ cultivars with mean values of ۴۷.۴۵ ± ۲.۸۶ and ۱۲.۸۵ ± ۳.۱۳ represented the highest and lowest numbers of offspring, respectively. The intrinsic rate of increase varied from ۰.۲۵ female/female/day in aphids reared on cv. Shiroodi to ۰.۱۱ ± ۰.۰۱ female/female/day in those reared on cv. Juanillo ۹۲. Mean generation time for aphids ranged from ۱۴.۲ ± ۰.۰۷ days on cv. Shiroodi to ۱۹.۹۹ ± ۰.۰۷ days on cv. Juanillo ۹۲. According to the results, Shiroodi and Juanillo ۹۲ cultivars exerted the lowest and highest antibiosis effects on D. noxia population, respectively.

Keywords:

Russian wheat aphid , Wheat , Triticale , fertility , Age-stage two-sex life table