The Plantwise Diagnostic Field Guide is intended for all plant doctors and other plant health advisors around the world. The job of being a plant doctor is not an easy one. Since farmers can bring any crop with any type of problem to a plant clinic, there are many different kinds of plant disorders that a plant doctor will be asked to diagnose and give advice on. It is not possible for a plant doctor, or anyone else for that matter, to be an expert on all crops and all plant health problems. This diagnostic field guide is designed to provide support to agricultural advisory staff as a field tool to assist in diagnosis of plant health problems prior to making management recommendations.