The California red scale, Aonidiella aurantii (Maskell) is one of the most important insect pests infested citrus trees in Egypt. Field experiments were conducted during two years (2020 and 2021) on A. aurantii on sweet orange trees at Nubaria district, Beheira Governorate, Egypt. The results indicated that, the population of A. aurantii recorded four peaks of abundance (four generations / year). During the 1st year, 2020 the outbreaks of the pest were occurred in April 8th, July 8th, the third one appeared in September 15th and the fourth was recorded in November 15th. In the 2nd year, 2021 the total number of A. aurantii scales also showed four peaks of abundance recorded in April 22nd, July 1st, September 1st and November 1st. The results also clearly shown that the insect prefer the upper leaf surface, the eastern direction and the middle strata than the other direction and strata of the sweet orange trees. During the 1st season, 2020, the parasitism rates with Aphytis sp ranged from 4.62% (on mid-January) to 19% (on mid-June). During the 2nd year 2021, the parasitism rates ranged between 6.36% (on January 1st, 2021) and 25.71% (on June 8th, 2021). The tested insecticides can be arranged according to their effect on A. aurantii as follows, Sulfoxaflor, Pyriproxyfen, Azadirachtin, Acetamiprid and Kz oil, respectively when the crawlers was the target and Kz oil, Sulfoxaflor, Azadirachtin, Pyriproxyfen and Acetamiprid when the adults were the target.