Fungicides are chemical agents that inhibit or eliminate mycelial growth or fungal spores. The chemical, physical, and biological characteristics of a fungicide determines its suitability for control of a determined disease. In this book, the authors present current research in the study of the classification, role in disease management and toxicity effects of fungicides. Topics discussed in this compilation include plant-derived biofungicides; tricyclazole and azoxystrobin in rice blast management; fungicides and their role in disease management; classification of fungicides; and effective fungicides for cereal crops protection against toxicogenic fungi causing fusarium head blight.