الفهرس 
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Abstract
ABSTRACT
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. Also, biological studies on the predator, Hippodamia convergens Guerin-Meneville were conducted under laboratory conditions. Data indicated that four aphid species were surveyed including Aphis craccivora Koch, Acyrthosiphon pisum (Harr.), Aphis gossypii Glov. and Hyalopterus pruni (Geof.). The recorded aphidophagous predators Hippodamia convergens, Coccinella undecimpunctata Linn., Coccinella septempunctata Linn., Chrysoperla carnea (Steph.), Syrphus corollae Fabr. and Orius albidipennis (Reut.). Obviously, H. convergens 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 and immature survival of H. convergens. Temperature also affected adult longevity, ovipositional periods, and fecundity. Moreover, prey type affected development, feeding consumption, immature survival. The tested preys also affected survival, ovipositional periods, fecundity, adult longevity and the total consumed preys by adult stage. Data further indicated that females that mated three times showed higher fecundity and longer longevity and ovipositional period than those mated once or twice.
Keywords:
Ladybird beetles, Hippodamia convergens, Aphis craccivora, Hyalopterus pruni, Acyrthosiphon pisum, Aphis gossypii, Rhopalosiphum padi, reproduction, development, mating, temperature.