There are many current threats to the citrus industry, this is a timely effort to publish a book covering recent challenges and progress to their approaches to improve conditions. This book is useful to researchers, academicians, scientists to enhance and boost their knowledge for further research on citrus. There are few reviews and books dealing with various aspects of citrus industry. Existing publications are over 10 years old and do not have recent updated knowledge of citrus industry. Global appeal - Citrus is mainly produced commercially in 140 countries, primary producers are Brazil, China, United States, and Mexico.