Selected life history characteristics of citrus brown mite, Eutetranychus orientalis (Klein), were studied at four constant temperatures (20, 25, 30 and 35 °C). Egg-to-adult developmental time of female ranged from 22.32 days at 20°C to 12.43 days at 30°C. An average of 305 degree-days was required to complete development above the lower threshold temperature (6.37 °C). Preimaginal mortality was 19.61, 22.76, 43.11 and 100 % at 20, 25, 30 and 35°C, respectively. Mean longevity of female E. orientalis ranged from 16.57 days at 20°C to 7.50 days at 30°C. Mean total fecundity ranged from 14.56 to 16.33 eggs / female. The sex ratio (female %) ranged from 75 to 80 %. Intrinsic rate of increase (rm) ranged from 0.144 at 30°C to 0.094 (individual per female per day) at 20 °C. The population had the ability to double with the shortest time at 30 °C (4.79 d) to the longest time at 20 °C (7.33 d). These data can be used to develop computer simulation models to predict E. orientalis development and population dynamics.
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Vol. 14 • No. 1