This book launches into the analytical approach which was used in the two previous books by the author on tomato and cucurbitaceae diseases. It will facilitate the identification of parasitic and non parasitic diseases in tobacco nurseries, in the field and during curing and storage. It provides data on the biology of the phytopathogenic microorganisms involved and it will help the reader to choose which control methods should be implemented. This book, with its original structure and abundant illustrations (more than 500 photos), is not only a simple, logical and pedagogical tool for diagnosing diseases but also an overview of recent data on parasitic and physiological diseases of this model plant. As a reference book, it replies to the demands of phytosanitary experts, scientists, students and teachers.