This book summarizes nanotechnology-based agricultural research for crop productivity and the management of various plant pathogens. It deals with the application of nano-molecules for quick, cost-effective, and precise plant disease diagnostic procedures, plant pests and disease management, nano-pesticides, and nano-diagnostics. Further, it explains nanomaterials for biotic stress management, with an insight into the synthesis and modification of nanomaterials and their potential applications in different domains for disease management.