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The development, survivorship, and reproduction of brown citrus aphid, Toxoptera citricida (Kirkaldy), were evaluated at 8 constant temperatures (8, 10, 15, 20, 25, 28, 30, and 32 degrees C). The developmental periods of immature stages ranged from 63.1 d at 8 degrees C to 5.5 d at 30 degrees C. The lower developmental threshold for the brown citrus aphid immature was estimated at 6.27 degrees C. The upper temperature threshold of 31.17 degrees C for development of nymph was determined from a nonlinear biophysical model. The percentage of survivorship of immature stages varied from 81 to 97% within the temperature range of 8-30 degrees C. However, survivorship was reduced to 29% at 32 degrees C. The average longevity of adult females ranged from 60.0 d at 10 degrees C to 6.5 d at 32 degrees C. The average progeny per female was 52.5 at 20 degrees C and 7.5 at 32 degrees C. The largest r(m) (0.3765) occurred at 28 degrees C. Populations reared at 10 and 32 degrees C had the smallest r(m) values of 0.0588 and 0.0960, respectively. The mean generation time of the population ranged from 51 d at 10 degrees C to 8 d at 32 degrees C. The optimal range of temperature for T. citricida population growth was 20-30 degrees C. Several mathematical functions were used to quantify brown citrus aphid development, survivorship, reproduction and lifetable parameters in relation to temperatures.