This book discusses the importance of applying fungicides in the field on the final quality of soybean seeds, evaluating the physiological potential of seeds, vigor, performance and health, illustrated with tables and figures and accompanied by recent bibliographical references. It is therefore an up-to-date book, with an important contribution from the author in the interpretations, discussions and opinions on the subjects covered, presented in a fluent and easy-to-read manner. However, the reader's familiarity with seed technology and related knowledge will make the reading more fruitful. The publication has its place, filling the gap that still exists as a source of subjects that are still little explored today. This book should therefore serve as a source of consultation for post-graduate students, technicians, teachers and researchers concerned with the subject of seeds, as well as for undergraduate students, especially those interested in this area.