The obtained results showed that the population fluctuation of Milviscutulus mangiferae (Green)was studied on mango trees for the two successive years (2016/2017) and (2017-2018) in Qalubyia Governorate, the activity of M. mangifrae took place from early April until January with three periods of high activity synchronized with the three growth flushes of mango trees, these periods of the activity of the tree and the studied pest recorded in spring, summer and autumn.Milviscutulus mangiferae on mango trees indicated the occurrence of three generations per a year. The first generation (spring), with duration of 4.5 and 4 months during two years. The second generation (summer) with duration of (2&3 months). The third generation (autumn/wnter) with duration of (5&4.5 months), (marked by hibernated adult females).There were abnormal relationship between the total population and the metrological factors.The activity of the associated parasitoid Coccophagus scutellaris (Dalman)started from May until Feb. with synchronization of the pest occurrence, the high activity of the two years of study recorded on [(mid May, 1^st Aug., mid Oct. and 1^st Jan.) with (12, 16, 35 and 12 individuals)] and [(mid May, mid Jul., 1^st Oct. and mid Nov.) with (14, 11, 28 and 23  individuals)]   respectively.The rate of parasitism ofC.  scutellarishad a four generations (period of parasitism) per a year of studyin spring, summer, autumn and winter (parasitized on over wintered stages).