Background: Cotton Mealybug, Phenacoccus solenopsis (Hemiptera: Pseudococcidae) is a major cotton pest in several countries. It is highly invasive, cryptic and polyphagous pest inflicting severe crop damage in economically important crops worldwide. Icerya aegyptiaca (Douglas, 1890) (Hemiptera: Coccoidea: Monophlebidae) is commonly known as Egyptian mealybug. Materials: Pre adult, Ovipositor female and Adult female of Phenacoccus solenopsis and Icerya aegyptiaca were treated with the spores of B. bassiana and M. anisopliae using the concentrations of 1x102, 1x103, and 1x104 spores / ml. Results: The percent mortality of Pre adult of Phenacoccus solenopsis was 86.04 % at 1 X 104 spores/ ml. of Beauveria bassiana after 5th days of infection and 81.39 % mortality at-the same concentration of Metarhizium anisopliae with. The ovipositor female of P. solenopsis was 95.5 % at 1 X 104 spores/ ml. of B. bassiana after 5th days of infection and 97.9 % the same concentration of, M. anisopliae. The adult female of P. solenopsis was 95.0 %, at 1 X 104 spores/ ml. of B. bassiana after 5th days of infection and 100 % at the same concentration of M. anisopliae. The Pre adult of Icerya aegyptiaca was 60.0 % after 5th days, at (1 X 104 spores/ ml.) of B. bassiana but after 5th days of infection with, M. anisopliae was 52.0 % with the same concentration. The ovipositor female of I. aegyptiaca was 43.0 % after 5th days, at (1 X 104 spores/ ml.) of B. bassiana but after 5th days of infection with, M. anisopliae was 34.0 % with the same concentration. The adult female of I. aegyptiaca was 50.0 % after 5th days, at (1 X 104 spores/ ml.) of B. bassiana but after 5th days of infection with, M. anisopliae was 75.0 % with the same concentration.