AbstractThis review is directed toward the study of the physiology and biochemistry of parasitic fungi on insects and stresses the usefulness and utility of these organisms from the standpoint of applied research and biotechnology. The review covers the principal contributions made by investigators toward elucidation of the infective mechanisms of the entomogenous fungi, and the various biochemical attributes of these organisms. The interplay of the various enzymes and associated biochemical substances which are involved in the infective process is discussed as well as the important studies of the peculiar physiology frequently associated with these microorganisms.