Plant pathology has been playing a vilal role In accomplishing food security In view of declining natural resources like land, water and human resources coupled with climate changes, the science of plant pathology should play a dominant role to produce more with lessening resources. It is more advanced today than ever before with new developments in disease diagnosis, the discovery of new generation molecules with low enwonmental impact reliable biological control agents as well as the development of new disease resistant plant varieties This book provides an up to date knowledge on taxonomy of fungi, threats of invasive and emerging diseases, disease diagnostics, interaction of host and pathogens, induced host resistance, utilization of biological control agents tor practical applications and the underlying mechanisms. RNAi mediated gene silencing, strategies to Identify targets for new disease control with plant derived products and chemicals and special emphasis on bo-security for safeguarding agricultural production and trade This book is the most comprehensive resource of current knowledge and will be highly useful to academia or industry related to crop heallh management.