An improved transformation method for the biocontrol agent, Beauveria bassiana, was developed. For convenience of transformation selection and detection, the coding regions of the genes for phosphinothricin acetlytransferase and green fluorescent protein were fused and an expression vector, pBFT, carrying this fusion was constructed. Under optimum conditions, over 60 transformants mu g(-1) plasmid DNA were obtained. B. bassiana conidia frozen 1 month at -80 degrees C were fully competent for transformation. The method was significantly less laborious and more rapid than current methods for B. bassiana. The bar::egfp provides a selectable and visible marker which may expedite future genetic engineering of this fungus.