This book explores the use of essential oils as an ecological alternative to control Botrytis cinerea, a fungal pathogen that threatens crops and ornamentals. It offers an in-depth look at the activities of essential oils against gray mold, highlighting their potential as an effective means of control. The various effective essential oils are presented, with a review of their active compounds and specific mechanisms of action. Application methods, such as foliar treatments, soil treatments, fumigations and preventive applications, are explained in detail, offering readers practical advice on how to implement them. The book also highlights the ecological benefits of essential oils, including their low impact on the environment and their role in enhancing plant resistance. Scientific studies demonstrating the efficacy of essential oils complete the book, providing solid proof of their usefulness.