Adhatoda zeylanica Medic. is a sub-herbaceous and evergreen medicinal plant viz. indigenous to India. It is commonly known as Adhatoda, Adulsa, Vasaka, etc. Since 200 years, roots and leaves of this plant are being used to cure cough, rheumatism, malaria, fever, chronic fever, intrinsic haemorrhage, asthma, leprosy, skin diseases, piles and many respiratory disorders. It is also reported as an expectorant, abortificiant, antimicrobial, antitussive and anticancerous. Hence, this plant has great demand in market in the form of crude drugs. However the leaves, which have great medicinal importance are infected due to attack of fungal pathogens In this book attempts are made to analyze the changes in biochemical content due to fungal diseases and suggests some control measures thereto by using different types of plant leaves extracts. The book will be helpful for the students and researchers in field of Medicinal plants. Besides it will helpful for study of plant pathology, mycology, biochemistry, etc.