This study aimed to investigate the population fluctuations of aphids and their associated predators in alfalfa, faba bean, cantaloupe and apricot trees at Ismailia Governorate, Egypt. Obviously, Hippodamia convergens Guerin-Meneville was the dominant predator associated with aphid infestations on all studied crops. In biological studies, data indicated that temperature had a significant influence on the development, feeding consumption, immature survival, adult longevity, ovipositional periods, and fecundity of Hippodamia convergens. Moreover, prey type affected development, feeding...