Aims: The aim of this study was to develop an easy but robust method for mass production, to formulate and compare the efficacy of mass produced conidia of a local isolate Metarhizium anisopliae against aphids and oil - formulated conidia against whiteflies. Study Design : The randomized complete block design with replications. Place and Duration of Study: 2012 - 2014, Laboratory of Crop Protection Department, Faculty of Agricultural Engineering and Veterinary Medicine, Lebanese University. Methodol ogy: Isolate of fungal entomopathogen M. anisopliae (Metschn.) Sorokin (LIM1) was grown on cooked rice, wheat, vegetable peels and burgul in roasting bags to produce and harvest spore powder. The cultures were dried and total yield of harvested conidia was determined. After harvesting, spores were submitted to quality control to assess concentration, germination, purity, moisture content and pathogenicity against rose aphid, Macrosiphum rosae L., mealy plum aphid,