Biocontrol Mechanisms of Endophytic Microorganisms introduces endophytic microorganisms, colonization, diversity and distribution, describes the isolation and identification of endophytic microorganisms by traditional cultivation and by next generation sequencing technologies, and covers biocontrol mechanisms, bacterial priming, endophytic based methods, the significance on fungi, and metabolite based formulations. The book concludes with chapters on biofilms, microbiota and safety issues of microorganisms. The intensive use of chemicals to control these plant pathogens has resulted in negative consequences such as the release of toxic chemicals in the environment, reduced soil fertility and human health problems. Therefore, environmentally-friendly and sustainable replacement of chemical fertilizers or pesticides is highly challenging.