الفهرس 
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Abstract
The experiment trials were conducted at the experimental farm of the Faculty of Agriculture, Mansoura University, Egypt during two successive seasons 2001 and 2002 to investigate the relative susceptibility of three soybean varieties to major insect pests and determine the population density of these insect pests and their natural enemies. The soybean varieties were Giza 21, Giza 35, Giza 82. <U+F049>. A. Visual examination Bemisia spp. complex was the most abundant on variety Giza 82 and Giza 21, while A. chalcytes was the less abundant one. Spodoptera littoralis was the most abundant on Giza 35 variety. During the second season, S. littoralis was the most abundant on the three varieties. Among the natural enemies associated with soybean insects, P. alfierii formed the highest population density on the three varieties. While, C. undecimpunctata was the less abundant on the varieties Giza 35, Giza 21.(Qf (BDuring the second season T. basalis was the most numerous species on the three varieties of soybean. I. B. Sweepnet. Nezara viridula formed the highest population density of the insect community on the three soybean varieties. Moreover, M. cunctans represented the lowest percent on the three varieties during 2001 season. Empoasca lybica formed the highest population density of the insect community on the three soybean varieties. Moreover, Exitanus capicola represented the lowest percent on the three varieties during season 2002. Eleven natural enemies associated with the soybean insects. Trissolcus basalis formed the highest population density on all varieties in both season of study. III. Yellow sticky trap (YST): Bemisia spp. complex were the most abundant on the three varieties Moreover, E. lybica was the lowest one on the three varieties during the first season of study. whereas, during the second season, Bemisia spp. complex were the most abundant one on the three varieties of soybean. Also, on the three varieties studied E. mundus occupied first rank during the two seasons of study.