Study on Life Table Parameters of Clitostethus arcuatus (Rossi), feeding on Trialeurodes vaporariorum (Westwood)
2010
Yazdani, M. | Zarabi, M. | Samih, M. A.
Clitostethus arcuatus (Rossi) is one of the most important predators of whiteflies same as Trialeurodes vaporariorum. In this resent study life table parameters for Clitostethus arcuatus (Rossi), when feeding on greenhouse whitefly under controlled conditions 25±2ºC, 65±5%RH and L-D: 16-8. In this purpose 120 eggs of ladybird (0-18 h-old) were selected randomly from mass culture of C. arcuatus which were reared on Trialeurodes vaporariorum. Results showed that, the rate of ex (expectation of life table at age X) after hatching the eggs rose slightly but after that it decreased regularly. Also (dx) in appearing of adults on T. vaporariorum 0.21 which implied that 79 percentages of cohort have dead before reaching to adult. Frequency distribution of death in cohort was 0.083 in the first day that this parameter in next days has irregular fluctuation and in the last day of immature period was at least 0.09. Developmental period and preoveposition period were 27/68±0/31 and 6/86±0/35 days respectively. Results of life table parameters showed that: Mean generation time (Tc) for ladybirds which were reared on greenhouse whitefly was 43.4t1. days, Net reproductive rate (R0) was 224.6 (females/female), Gross reproductive rate (GRR) was 258.8 (females/female). In this study the intrinsic rate of increase (rm) and (DT) were 0.063±0.002 (female/female/day) and 11/1±0/27 days, the finite rate of increase (ë) on greenhouse whitefly was 1.065±0.002 days.
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