Citrus red-scale, Aonidiella aurantii (Maskell) (Hemiptera: Diaspididae) is an armored scale infested orange trees at Kafr-Eldwar, El-Beheira Governorate. It was subjected to be controlled. Two experiments were performed to test five summer mineral oils (Super Masrona oil^® 95%, Diver oil^® 97%, Tiger oil^® 97%, Kz oil^® 95% and CAPL2 oil^® 96.62%) and neonicotinoid systemic imidacloprid insecticide (Admire^® 20% SC)against A. aurantii in a private orchard of orange trees (pre-flowering stage in early spring (2010) and during fruiting stages in early summer (2011)).Results indicated ascending increasable reduction effect with time intervals up to two months against A. aurantii. It was observed that reduction effect caused by mineral oils had increased as purification percentages increase. It could be recommended that, light summer oils gave successful control against armored red-scale insect which infest orange trees, where they were more effective and less environmental hazards than the other tested insecticide (Admire^® ).