This thesis explores the life circles, key death factor, survivor curve and life tables of eleven generation's greenhouse whiteflies on six kinds of host plant (cucumber, string bean, tomato, eggplant, celery and paprica). The death of individuals in these generations occured mainly in the nymph stage (mostly in the second and third instars) and pseudo-pupa stage. The main reason of their death are widely different according to the kinds of host plant: with regard to cucumber, tomato and string beans which ...