The present paper concerns with the survival rate in immature stages of the greenhouse whitefly, Trtaleurodes vaporariorum (Westwood), in the field and its mortality factors. Preliminary life tables of the whitefly were constructed for six consecutive generations established artificially on the weed, Solidago altissima L., in Fukuoka in 1977. The survival rate in the first generation was 48. 4 %, while those in other generations ranged from 0 to 6.1 %. Extinction of the sixth generation was caused by withering of leaves in early spring. Withering of leaves in the first to the fifth generations was caused by phytophagous insects feeding on leaves. Whiteflies at egg and larval stages died from withering of leaves attacked by the grasshopper, Atractomorpha debeli Bolivar, and those at egg, larval and pupal stages died from withering of leaves attacked by lepidopterous larvae. Two species of predators and one species of parasite were recorded. Coccinella septenpunctata bruckii Mulsant and Propylaea japonica Thunberg attacked larvae and pupae. The aphelinid parasite, Encarsia sp., emerged from pupae. This parasite was responsible for about 50 % loss of pupae in the second and fourth generations. However, the number of adult whiteflies was determined by the number of eggs laid rather than by total loss. Large part of the mortality by unknown causes seemed to be involved in the quality of the host plant.