الفهرس 
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Abstract
Specimens of mosquito larvae collected from different aquatic habitats from Dafash, Aboissa, Abo Yaqoob west, Shalaby and Om sant villages in Minia Governorate, were transmitted to the laboratory and reared for adult stage. Morphological characterization of each stage was examined for the identification of the species. Morphological characters revealed that the examined specimens belonged to Culex pipiens.
The preferred instars and stages of C. pipiens for the consumption by Eucyclops serralatus were only 1st and 2nd larval instars whereas the 3rd, 4th larval instars as well as pupa stage were escaped from injury. First larval instar of C. pipiens was the most affected as the average numbers killed were 6.0, 10.0, 13.0 and 16.0 from the total of 20 individuals after 24, 48, 72 and 96 hrs. from exposure to Eucyclops serralatus. Second larval instar came in the second rank whereas the killed numbers were 4.0, 5.0, 7.0 and 9.0 at the investigated periods, respectively.
Females of Macrocyclops albidus was the highest predation followed by Mesocyclops ogunnus, and the least predation was by Eucyclops serralatus. Also the obtained data showed that the increase in the number of larvae exposed to one female of the tested Cyclopidae caused increase in the killed number of C. pipiens 1st larval instar that ranged between 7 to 39 killed from the exposed 10 and 50 larvae, respectively by one female of Eucyclops serralatus and from 10 to 43 killed from the exposed 10 and 50 larvae by using one female of Mesocyclops ogunnus. Also, from 10 to 49 killed from 10 and 50 exposed larvae to one female of Macrocyclops albidus respectively.
These data revealed that 1st larval instar and pupa non infected by H. bacteriophora at the different of tested periods (24hrs. ,48hrs and 72 hrs. from inoculation, while the most observed infection happened with the fourth larval instar that influenced with high degrees and mortality percentages that observed gradually with the time passed after inoculation that ranged between 32.5 to 92.5 % mortality at 24hrs. and 72 hrs. of inoculation, respectively at the concentration of 50 JIII/ 40 exposed 4th larval instar of C. pipiens. The recorded mortality % with the concentration 100 JIII were 42.5, 87.5, and 100% after 24, 48 and 72 hrs. of inoculation, respectively. The effect of high concentrations of inoculation (150 and 200 JIII) were tested. The concentration of 150 JIII caused mortality of 52.5, 90 and 100 % at 24, 48 and 72 hrs, respectively. When the 4th larval instar of C. pipiens inoculated by 200 JIII l/ 40 fourth larval instar, the mortality was 57.5, 100 and 100 %, respectively.