الفهرس 
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Abstract
A culture of Coccinella undecimpunctata L. and Cheilomenes propinqua isis were kept in the laboratory of the Economic Entomology Department, Faculty of Agriculture, Mansoura University. A stored colony of C. undecimpunctata and C. propinqua isis consisted of 50 adults was collected from a peach and guava trees in Mansoura University. Following transfer to the laboratory, the insects were kept in ventilated jars, fed on frozen eggs of the flour moth, E. kuehniella, and water, then put in the incubator set to a 16:8 L:D photoperiod and a constant temperature of 25.0 ± 1oC until their use in the experiments. For egg-laying, adult females were isolated in Petri- dishes (10 cm in diam) and fed on A. gossypii. The purpose of the present study was to:1. Evaluation of effectiveness of an artificial and natural diets on the biological aspects of the mentioned predacious species to be used at the time of shortages of natural insectary preys. 2. Comparison between the artificial diet and E. kuhniella eggs on the survival percentage of C. undecimpunctata and C. propinqua isis. 3. Estimating the thermal threshold and developmental rate of the two coccinellid predators C. undecimpunctata and C. propinqua isis. 4. Comparison between three temperature degrees to estimate the best degree for mass rearing of predators C. undecimpunctata and C. propinqua isis. The results showed that:- 1- On the artificial diet, as the temperature increased the developmental time from egg to adult of the eleven-spotted ladybird Coccinella undecimpunctata L. was significantly prolonged. 2- The survival percentage from egg to adult of C. undecimpunctata at different temperature degrees on E. kuhniella eggs recorded insignificant variations. 3- There were significant differences for different temperature degrees, different tested diets and their interaction on the fecundity of the predator of C. undecimpunctata. 4- The average of the total degree-days needed for development of C. undecimpunctata feeding on E. kuhniella eggs and artificial diet under different temperature degrees were 615.00 ± 13.4 and 491.2 ± 53.0 degrees, respectively. 5- On the artificial diet, as the temperature increased the developmental time from egg to adult of the ladybird Cheilomenes propinqua isis (Mulsant) was significantly decreased. 6- The survival percentage from egg to adult of C. propinqua isis at different temperature degrees on E. kuhniella eggs recorded insignificant variations. 7- There were significant differences for different temperature degrees, different tested diets and their interaction on the fecundity of C. propinqua isis. 8- The average of the total degree-days of C. propinqua isis feeding on E. kuhniella eggs and artificial diet under different temperature degrees were 468.4 ± 21.48 and 386.9 ± 47.44 degrees, respectively.