The population dynamics of the soft-scale insect, Kilifia acuminata (Sign.) was studied on mango trees in the Bilbies district of the Sharkia Governorate during the two seasons (2020–2021 and 2021–2022).  Results revealed that the pest had three overlapping generations on mango trees per year, each lasting about four months. .The monthly average population density of K. acuminata alive stages on mango trees varied between 40.9 and 310.9 individuals/20 leaves and the highest number occurred in September 2021 during the first season. . While in the second season, the monthly average population density varied between 22.9 and 237.4 individuals/20 leaves and the highest number occurred in July.. The preferable directions for trees were west and east in the two seasons, respectively. Throughout the present period of study, only one parasitoid species (the endoprasitoid, Metaphycus zebratus (Mercet) (Hymenoptera: Encyrtidae) attacks K. acuminata.The mean number of parasitoids was relatively higher in the second season than in the first one. Statistical analysis revealed that the population fluctuations due to the combined effects of daily mean temperature and RH%, which were also influenced by some chemical constituents in mango leaves.