Microorganisms in soil are critical to the maintenance of soil function in both natural and managed agricultural soils because of their involvement in such key processes as soil structure formation, decomposition of organic matter, toxin removal and the cycling of carbon, nitrogen, phosphorus and sulphur. In addition microorganisms play key roles in suppressing soil borne plant diseases in promoting plant growth and changes in vegetation. The book Microbial Resources for Crop Improvement takes stock of present status of research in exploration of microbial resources for the management of plant diseases which will cater to the need not only of the students teachers researchers but all well wishers of farmers.