This book has been six chapters viz., Introduction, Review of Literature, Material and Methods, Experimental results,Discussion and Summary. It contains valuable informations on pathophysiology, morphological and physical characteritics of carnation wilt pathogen, (Fusarium oxysporum f.sp.dianthi) and biological control by using liquid formulation of Pseudomonas fluorescens.This book is very useful for the researchers and Post Graduate students in the field of Plant Pathology.