The purpose of this course, is to introduce different aspects of biological control of plant diseases. Start with history, definition and ecological rlation,etc.,hope this arrangement will improve understanding of what is biological control of plant diseases. After the mid-term exam, a control method for the control of insect pests by the entomogenous microorganism pupae will be introduced. In general, to achieve the purpose of microbial control, it usually includes the purposeful cause of rickets, or the use of naturally occurring rickets, and entomogenous pathogens, including bacteria, fungi, viruses, protozoa and nematodes.