Biological parameters of Schizaphis graminum (Rondani) reared on an ancient wheat species (Einkorn) from England and five Iranian wheat genotypes (Azadi, Ommid, Marvdasht, Pishtaz and Moghan 2) were studied under controlled conditions at 22 ± 1°C, 65 ± 5% RH, 16:8 (L:D) h. The lowest rm value (0.261± 0.002 females/female/day) and net reproductive rate (R0) (28.747± 0.369) were recorded on Einkorn. The highest and the lowest finite rates of increase (λ) were on Moghan 2 and Einkorn, respectively. Also, the longest mean generation time (T) and doubling time (DT) with the lowest percentages of nymphal survival (79.5%) and fecundity over developmental time (35.739± 0.378 nymphs/female/day) were obtained on Einkorn. Adult longevity varied from 10.72± 0.123 days on Einkorn to 18.04± 0.212 days on Moghan 2. Therefore, our results showed that Einkorn, exerting a high level of antibiosis compared to other tested genotypes, may decrease the population density of the greenbug.
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Vol. 122 • No. 4