Population growth statistics and age - specific life table parameters were estimated for whiteflies, Bemisia tabaci (Gennadius) and Bemisia argentifolli (Perring) on four host plants (cucumber, cotton, zucchini and tomato) at various temperatures under field conditions. Results indicated the pronounced effect of temperature and host plant on these statistics. Cucumber and zucchini performed the better rates for population growth of both species, especially within the favorable range of temperature (25 - 30°C). However, SLWF showed high rates for survival, fecundity and population growth in comparison to SPWF on the tested host plants and temperatures. These parameters were more sensitive to the changes in developmental times, fecundity and survival rates than other life history components, which should be taken into consideration when a successful plans are to be proposed for management and control programs of this pest.