The successful application of various nanoplatforms in medicine under in vitro conditions has generated some interest in agri-nanotechnology. This technology holds the promise of controlled release of agrochemicals and site targeted delivery of various macromolecules needed for improved plant disease resistance, efûcient nutrient utilization and enhanced plant growth. Processes such as nanoencapsulation show the benefit of more efûcient use and safer handling of pesticides with less exposure to the environment that guarantees ecoprotection. The uptake efficiency and effects of various nanoparticles on the growth and metabolic functions vary differently among plants. Nanoparticle mediated plant transformation has the potential for genetic modification of plants for further improvement. Specifically, application of nanoparticle technology in plant pathology targets specific agricultural problems in plant–pathogen interactions and provide new ways for crop protection. This book covers all the aspects of this subject. It is hoped, the book will be found to be of immense value to the students of this subject.