The effect of six temperatures and three relative humidities on the developmental period of immature and the fecundity of Parabemisia myricae (Kuwana) was studied, separately, in the laboratory. The developmental time from egg to adult stage was 79.7; 41.7; 24.4, and 22.0 days at 15, 20, 25, and 30-degrees-C temperatures, respectively. The developmental time at the fluctuating temperatures of 25/35-degrees-C (12/12 h) was 24.2 days. With increasing relative humidity at 25-degrees-C constant temperature, the total developmental time decreased significantly from 26.7 days at 40 % RH to 20.3 days at 90 % RH. The mortality rate was lowest at 25-degrees-C and was highest at 30-degrees-C and 25/35-degrees-C. It was also found that temperatures above 35-degrees-C were lethal, since all eggs were killed at 35-degrees-C. At the three relative humidities tested, the mortality rate of the egg stage was highest at 90 % RH (20 %) and about 44 % of the immature stages were killed at 40 % RH. The adult's (female) longevity and the reproduction changed with changes in temperature; oviposition rate increased by the increase in temperature up to 25-degrees-C then remained at the same level.