The susceptibility of RPW to two entomopathogenic fungi, Metarhizium anisopliae and Beauveria bassiana, strains of the former were found to be more virulent than those of the latter, achieving 100% larval mortality after 9 days by using the high concentration, 2.2 x 10 ⁵ spores /ml. of Metarhizium anisopliae but after 10 days by using of the high concentration, 2.2 x 10 ⁵ spores /ml. of Beauveria bassiana. The most virulent strains of M. anisopliae were then tested on RPW larvae then adults and Pupae.