This fourth volume of this 4-volume set discusses the key diseases, typical symptoms, and management strategies of several economically important plants. Each chapter presents an introduction along with a detailed account of symptoms, causal organisms, disease cycles, epidemiology, and management of a selection of major plantation crops, medicinal crops, and mushrooms. The book features chapters contributed by eminent professionals in the field, who have incorporated their own experience and knowledge along with an overview of the recent developments in their fields. They provide information on the diagnostic tools and management techniques needed for such plantation crops as areca nut (or betel nut), cocoa (or chocolate), coconut, coffee, and tea; such medicinal crops as isabgol and senna; along with several kinds of mushrooms. The volume also includes photographs that show symptoms of important diseases, which are helpful in disease diagnosis. The volumes provide an abundance of information for understanding and managing plant diseases, with emphasis on diagnostic techniques. The collection includes: Volume 1: Fruit Crops Volume 2: Vegetable Crops Volume 3: Ornamental Plants and Spice Crops Volume 4: Important Plantation Crops, Medicinal Crops, and Mushrooms