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Biological studies including population growth parameters of the predatory mite amblyseius barkeri acari phytoseiidae at 25 c in the laboratory



Biological studies including population growth parameters of the predatory mite amblyseius barkeri acari phytoseiidae at 25 c in the laboratory



Entomophaga 34(2): 275-287



Amblyseuis barkeri (Hughes) fed on Thrips tabaci (Lind.) at 25.degree. C showed an average duration of 2.2, 0.8 and 3.2 days for the egg, larval and nymphal stages, with mortalities at 1.0, 1.0 and 3.1%, respectively. Females represented 63% of the population and required multiple matings for optimal fertility. The oviposition period was 20.3 days and the average oviposition rate 2.3 eggs per day. The intrinsic rate of increase was 0.22 per day. The expected life span was 29.6 days for .female.female. and 27.4 days for .male.male. A. barkeri .male.male. both consumed 3.3 nymphs of thrips per day (mean value for the feeding stages). The larva does not take up food. In the absence of thrips A. barkeri was able to consume two-spotted spider mites. Tetranychus urticae (Koch), and their eggs, adult brod mites Polyphagotarsonemus latus (Banks), and pollen of various plants. Cannibalism was observed when food was lacking. Certain morphological features, egglaying, mating and predatory behaviour are described.

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