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The life history of the twospotted spider mite, Tetranychus urticae Koch, was studied in order to construct a life table and to establish an intrinsic rate of increase for use in population management with predators. Completion of life cycle in the laboratory required 7.5 days at 27±1°C and 95±5% RH. Mean generation time was 16.0 days and the quiescent period between deutonymph and active adult for females was 2.4 days. The reproductive rate was 7.97 eggs/♀/day. A life table was constructed to estimate the population dynamics by intrinsic rate of increase (r=0.336), mean generation time (13.6 days) and net reproductive rate (97.4).
Shih et al. (1976) studied this question.