The present work, an effort was made to study some ecological aspects and chemical control of two diaspid scales, white mango scale, Aulacaspis tubercularis Newstead and olive parlatoria scale, Parlatoria oleae (Colvee) (Hemiptera: Diaspididae) on mango trees at Nobaria district, Beheira Governorate, Egypt. The study lasted two years from the beginning of 2019 to the end of 2020. The results showed that the total population of white mango scale recorded three peaks on mango trees. The three peaks were occurred on January 15th, March 12th and September 17th throughout the 1st year, 2019. In the consecutive year, 2020 such three peaks were recorded on January 21st, March 31st and September 22nd. The mango leaves at middle stratum and east direction were the most preference leaves by A. tubercularis. On the other hand, three peaks were recorded by P. oleae on March 26th, May 21st and October 8th during first year and on March 17th, June 19th and September 29th during the 2nd year. The leaves at lower stratum and tree core were the most preference leaves by P. oleae. Both scale species significantly preferred the upper surface of mango leaves than the lower one. The efficacy of four insecticides (botanical insecticide, mineral oil, IGR and neonicotinoid insecticide) for controlling the two scales were applied to insure that: Acetamiprid was the highly effective insecticide against A. tubercularis and Pyriproxyfen was the highly effective one for P. oleae. A. tubercularis was more tolerant to the tested insecticides than P. oleae.