Synthetic insecticides, e.g. organophospate and pyethroid, are common used to control diamondback moth, Plutella xylostella (Linn.). Survey conducted in West Java and South Sumatera showed that this pest could not be controlled completely by using many insecticides. This experiment was aimed to assess the efficacy of liquid based bio insecticide formulation from Beauveria bassiana (Bals.) Vuill…