Tarbiat Modares University Journal of Crop Protection 2251-9041 1 2 2012 06 01 Effect of four wheat cultivars on life table parameters of Schizaphis graminum (Hemiptera: Aphididae) 121 129 1039 10.48311/jcp.2012.1039 EN Sheyda Goldasteh Department of Entomology, Faculty of Agriculture, Islamic Azad University, Arak, Iran. Ali Asghar Talebi Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran Ehsan Rakhshani Department of Plant Protection, Faculty of Agriculture, University of Zabol, Zabol, Iran. Ehsan Rakhshani Department of Plant Protection, Faculty of Agriculture, University of Zabol, Zabol, Iran. Shila Goldasteh Department of Entomology, Faculty of Agriculture, Islamic Azad University, Arak, Iran. Journal Article The life table parameters of <em>Schizaphis graminum</em> (Rondani) (Hemiptera: Aphididae) on four commercial cultivars of wheat (Kohdasht, Pastor, Tajan and Zagros) were determined in laboratory conditions. Fertility life table were constructed using age-specific survivorship (<em>lx</em>) and age-specific fecundity (<em>mx</em>) and subsequently analyzed using jackknife method and ANOVA. There were significant differences among pre-imaginal period and adult longevity of the aphid on the four wheat cultivars. The highest mortality occurred at first nymphal instar on all of wheat cultivars tested. The life expectancy (<em>ex</em>) of one-day-old adults was estimated to be 23.5, 24.6, 30.36 and 26.83 days on Kohdasht, Pastor, Tajan and Zagros, respectively. The gross reproductive rate was significantly higher on Tajan (102.39 ± 1.42 females/female/generation) compared with other three cultivars. The net reproductive rate (<em>R</em>­0) significantly differed on different wheat cultivars examined. The <em>R</em>0-value was highest on Tajan (82.21 ± 1.21) and lowest on Zagros (38.23 ± 0.63 females/female/generation). The highest and lowest values of the intrinsic rate of increase (<em>rm</em>) were 0.276 ± 0.002 (on Pastor) and 0.222 ± 0.001 day^-1 (on Zagros), respectively. The finite rate of increase (l) differed significantly among four wheat cultivars, ranging from 1.25 ± 0.00 (on Zagros) to 1.32 ± 0.00 days^-1 (on Pastor). Doubling time ranged from 2.51 ± 0.02 (on Pastor) to 3.12 ± 0.02 days (on Zagros). The longest mean generation time (<em>T</em>) of the aphid was obtained on Tajan cultivar. The results showed that the Zagros cultivar had the highest antibiotic effect on population growth of <em>S. graminum</em>. https://jcp.modares.ac.ir/article_1039_27ed0fb950b856b06e1273989422e7d3.pdf