Abstract
Results of studying the extent suitability of Hyalopterus pruni Geoffr. (Hemiptera: Aphididae) as suitable prey to the Lady beetles Coccinella novemnotata Herbst and Coccinella undecimpunctata L. (Coleoptera:Coccinellidae) on some biological characters of two predators, showed that there is no significant effects between the means of larval development period which was 2.8,2.6,3.4 and 3.6 days for the fourth larval stages period of C. novemnotata Herbst respectively, in comparison with 2.6,2.8, 3.4 and 3.6 days for C. undecimpunctata L. respectively, but there is significant effects between the means of pupal period which was 4.2 and 5.2 days for two predators respectively, the results also shows a significant effects on the means of oviposition period which was 26.67 and 22.33 days for C. novemnotata Herbst and C. undecimpunctata L. respectively but there is no significant effects between the means of preoviposition and postoviposition period which were 4.67,4.33,4.33 and 5.00 days for C. novemnotata Herbst and C. undecimpunctata L. respectively and thus the significant effects on the means of number of egg per female, dialy deposited and eggs hatching percentage which reached 2030.67 egg/ female,67.17egg/female/day and 89.22% for C. novemnotata Herbst respectively in comparison with 758.00 egg/ female, 36.46 egg/ female/day and 85.54% for C. undecimpunctata L. respectively but there is no significant effects between the means of incubation period which reached 2.35and 2.70 days for C. novemnotata Herbst and C. undecimpunctata L. respectively. Keywords: Coccinella novemnotata, C. undecimpunctata, Hyalopterus pruni, Biological characters.
