Development and life table of the laboratory population of Typhlodromus (Anthoseius) transvaalensis
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Key Words：Typhlodromus (Anthoseius) transvaalensis， life table， Acarus siro， Panonychus citri
Abstract：The development and reproduction of Typhlodromus (Anthoseius)transvaalensis (Nesbitt) feeding on Acarus siro L. at 27℃ were observed, and the life table of laboratory population was constructed. The results showed that the mite were parthenogenetic, and the developmental duration of eggs, larvae, protonymph, deutonymph and oviposition prophase were 2.00, 0.72, 1.96, 1.53 and 1.77 d, respectively. The development from egg to adult emergence needed 7.98 days. The average life_span and oviposition amount of the female mites were 14.82 d and 25.75 eggs, respectively. Net reproduction rate R0, mean generation time T, intrinsic rate of increase rm, finite rate of increase λ and doubling time t were 25.01，13.71，0.23，1.26 and 2.95 d, respectively. The effect of different humidity conditions on egg production and oviposition was also detected using humidity control in small space. The result indicated that the optimal humidity interval for egg production was 75.5%～85.0%. The development of adults and oviposition were adversely affected by high relative humidity (96.0% RH). T. transvaalensis prefered the larvae to other stages of Panonychus citri McGregor and the mean number preyed was 5.40 per day. It could hardly prey on the adult of P. citri.