The mealy-bug insect I seycellarum is a major insect pest which attacks mango trees and some ornamental plants in Egypt. Field investigation of the two successive years (2005-2006) showed that, tree core is the most favorable zone for insect population. The over all mean was 17.0 and 12.9 individuals / leaf during  2005 and 2006 respectively, while the lowest means were 10.6 and 9-6 individuals / leaf  during 2005 and 2006, respectively. There were insignificant differences between directions, but highly significant differences between tree core and all tree directions. Highly significant differences between insect population averages of seasons within each direction. Autumn and Summer were the most favorable seasons for the insect activities and distribution, while Spring and Winter had the lowest population, Seasons could be arranged dissentingly in order to magnitude as follows: Autumn, Summer, Spring and Winter. Means of respective seasons were 24.2 , 13.1, 9.1 and 7.5 individuals / leaf in 2005 versus 15.7 , 14, 9.5 and 6.1 individuals / leaf in 2006. the insect prefer the lower leaf surface over the upper one (99.04%)