Field experiments were conducted at a private mango orchard at Esna district, Luxor Governorate, Egypt during two successive years (2016/2017 and 2017/2018) to study the performance of some mango varieties to infestation with the plum scale insect, Parlatoria oleae (Colvee) (Hemiptera: Diaspididae). In this study, using different insect expressions, which articulated the population density of this pest.  Two insect expressions were utilized, i.e., insect population and incidence of infestation. The obtained results showed that insect population of P. oleae occurred on all different mango varieties all the year round and has three peaks of seasonal activity per year, which was recorded in October, April, and July during the first year (2016/2017) and through in November, April, and July during the second year (2017/2018) in all tested mango varieties. Furthermore, the percentages of infestation incidence by pest showed have three peaks per year, were recorded in November, April, and July on all different mango varieties during both the two years.
             The obtained results indicated that the mango varieties varied significantly in their susceptibility to population density and the percentages of infestation incidence by P. oleae. Balady mango variety was the highest population density and was rated as highly susceptible (H.S.) to infestation by the total population density of P. oleae, followed by Ewaise and Goleck mango varieties were appeared as susceptible (S), then by Zebda variety was seemed asrelative resistant (RR). In contrast, Sediek variety had the lowest population density and was rated as moderate resistant (MR) of pest over the entire year. The results of this research here could be used as a tool for establishing IPM strategies against this pest.