Effects of three constant (15, 20, and 25°C) and one alternating (16-22°C; mean, 19.5°C) temperatures on development, mortality, fecundity, and longevity of Liriomyza Bryoniae (Kaltenbach) on plants of the tomato cultivar Moneydor were examined in the laboratory. Development rates for each preadult stage were estimated. Lower thresholds for development and oviposition were at least 8°C and approximately 11°C, respectively. Optimum temperature for development and reproduction within the examined range was 25°C, Development rate from egg to adult with the alternating temperature regime did not differ significantly from that at 20°C, suggesting that development rate responds rapidly to a change in temperature. However, fecundity and oviposition rate with the alternating temperature regime were significantly lower than at 20°C, indicating a slower response of the reproduction to changes in temperature. At all temperatures examined, >85% of oviposition occurred within 100 degree-days of eclosion. Pupal length was positively correlated with temperature but not with development time, fecundity, oviposition rate, or longevity. Intrinsic rate of increase (rm) varied from 0.0457 viable female eggs per female per day at 15°C to 0.1841 eggs per female per day at 25°C. Net reproduction varied from nine viable female eggs per female at 15°C to 54 eggs per female at 25°C; generation time varied from 49 d at 15°C to 22 d at 25°C. Comparison with previous studies indicates that tomato is a more suitable host plant for L. bryoniae than for Liriomyza trifolii (Burgess) within the range of 15-25°C.