Survey of dominant insects occurred on Cichorium intybus , Asteraceae and their abundance were carried out throughout two successive seasons 2009/2010 and 2010/2011 at Qalubia governorate. The results showed that there are twelve insect species belonging to four orders and nine families were dominant on Chicory plant they were: Order : Diptera { Family Agromyzidae (Liriomyza trifolii (Burg) ,and Family Anthomyidae (Pegomia mixta (Witt.), Order: Hemiptera {Family Aleyrodidae Bemisia tabaci (Genn) , Family Aphididae (Aphis craccivora (Koch) , Aphis gossypii (Glover), and Myzus persicae (sulzer) , Family Cicadellidae (Empoasca spp.), Family Pentatomidae (Nezara viridula) and Family pseudococcidae (Planococcus sacchara (Cockerell), Order Lepidoptera { Family Noctuidae (Agrotis ipsilon (H.) and Spodoptera littoralis (Boisd.) and Order Thysanoptera { Family Thripidae (Thrips tabaci (lind) Population density of five insects infesting Chicory plants C. intybus L. was estimated during 2009 /2010 in the first season and the second season2010 /2011 , the study was insects studied were : L.trifolii ., B. tabaci ., A. gossypii, Empoasca spp., Th. tabaci .The obtained results showed that the white fly B.tabaci recorded the highest number (278.5 and 405.9 individuals / 5 leaves) followed by A. gossypii (2001and 238.7 individuals/5 leaves), Thrips tabaci (117.5 and 165.1 individuals /5 leaves), Empoasca spp (83.7 and 114.6 individuals / 5 leaves) and Liriomyza trifolii (74.8 and 107.6 individuals |5 leaves) during first and second season, respectively.