Groundnut (Arachis hypogaea L.) is one of the principal oilseeds and food crops of the world. Groundnut is suffer from many diseases among them early (Cercospora arachidicola Hori.) and late leaf spot [Phaeoisariopsis personata (Berk. & M. A. Curtis) Arx.] are most widely distributed and economically important foliar diseases of groundnut causing severe damage to the crop.This Book having very much importance for the student and researcher of pathology Discipline who are working on Groundnut Disease.