الفهرس 
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Abstract
The present study was carried out in both laboratory and the experimental field of Sakha Agricultural Research Station, Kafr El-Sheikh Governorate during two successive seasons (2008 and 2009) to study the evaluation of certain mortality factors in decreasing the populations of the following predators, C. undecimpunctata, S. syriacus, M. corollae. The efficiency of different mortality factors on C. undecimpunctata population On clover, cucumber, okra and corn 1- On clover: The highest rate of TM caused by parasitoids (38.64%) and the lowest by unknown mortality (0.85%). The mortality caused by bacteria came in the second rank (6.84%) after that caused by parasitoids and contributed with acceptable percentage in TM. (13.56%). Mortality caused by fungi contributed with low percentage in TM (8.46%). - In 2009 season, The highest percentage of TM caused by parasitoids was 50% and unknown mortality came in the second rank (19.12%) after that caused by parasitoids. The mortality caused by bacteria and fungi had the same contribution with acceptable percentage in TM (7.27%). 2- On cucumber: The highest percentage of TM caused by parasitoids was 48.84% and the lowest by unknown mortality was 4.65%. The mortality caused by fungi came in the second rank (22.09%) after that caused by parasitoids. Mortality caused by bacteria contributed with low fate in TM. (10.96%). - In 2009 season, the highest percentage of TM caused by parasitoids was recorded 34.86% and the lowest by bacteria was 10.09%. The mortality caused by unknown mortality came in the second rank (18.35%) after that caused by parasitoids. Mortality caused by fungi was relatively low (16.51%). 3- On okra: The highest percentage of TM. caused by parasitoids was 43.58% and the lowest by unknown mortality was 5.13%. The mortality caused by fungi came in the second rank after that caused by parasitoids and contributed with acceptable percentage in TM. (7.69%). There was no mortality caused by bacteria. - In 2009 season, The highest percentage of TM caused by parasitoids (32.74%) and the lowest by unknown mortality (3.89%). The mortality caused by fungi came in the second rank (6.09%) after that caused by parasitoids and contributed with acceptable percentage in TM (12.02%). Mortality caused by bacteria contributed with low percentage in TM (10.25%). 4- On corn: There was no mortality caused by any of bacteria or fungi. whereas, the highest rate of TM. caused by parasitoids (60.38%) and the lowest by unknown mortality (1.26%). - In 2009 season, the total population mortality caused by parasitoids and There was no mortality caused by any of other mortality factors, as well as the whole contribution in TM was recorded only by parasitoids * Tetrastichus coccinella is the most common parasitoid of C. undecimpunctata in Egypt. * Penicillum sp. and Fusarium sp. were recorded to be infect C. undecimpunctata. * Bacillus sp. was recorded to be infect C. undecimpunctata. * Homalotylus flaminius was recorded as a parasitoid of S. syriacus. * Pachyneuron sp. recorded as a parasitoid of M. corollae. * The Acrocrid parasitoid was recorded as a parasitoid of M. corollae. * The efficiency of three compounds, Biovar, Protecto and Malathion against four insect predators, Coccinella undecimpunctata, Scymnus syriacus, Metasyrphus corollae and Chrysoperla carnea.