Demographic parameters of the turnip aphid, Lipaphis erysimi (Kaltenbach) (Hemiptera: Aphididae), which is a serious pest of Brassica crops worldwide, were evaluated on five major Brassica vegetables (three varieties of Brassica oleraceae (Linnaeus) (Brassicaceae: Brassicales); kohlrabi, cabbage and ornamental cabbage, and two subspecies of Brassica rapa (Linnaeus) (Brassicaceae: Brassicales); Chinese cabbage and bak choi). The study was carried out under laboratory conditions at 25 ± 1°C, 70 ± 5% RH and 16:8 (L:D) h. Preadult developmental time, survival rate, female longevity, reproduction, and life table parameters were evaluated according to the age-stage specific life table method.The highest population growth parameters, i.e., net reproductive rate (R₀), intrinsic rate of increase (r), and finite rate of increase (λ) were recorded on kohlrabi (R₀ = 30.45 offspring, r = 0.2174 d^-1, λ = 1.2429 d^-1). These parameters were the lowest on Chinese cabbage (R₀ = 13.00 offspring, r = 0.1503 d^-1, and λ = 1.1621 d^-1) and bak choi (R₀ = 16.30 offspring, r = 0.1614 d^-1, λ = 1.1752 d^-1).The results attained from population growth parameters, together with population projection estimation based on the age-stage, two-sex life table theory, indicated that both Chinese cabbage and bak choi were less suitable hosts for turnip aphids and should be considered as a possible source for developing resistance in breeding programs and integrated pest management strategies.