This guide provides descriptions and photographs of the most common tomato diseases and
disorders worldwide. For each disease and disorder the reader will find the common name, causal agent, distribution, symptoms, conditions for disease development and control measures. We have also included a section on common pathways of tomato viruses. New to this guide are several bacterial, virus and viroid descriptions as well as several tomato disorders. The photographs illustrate characteristic symptoms of the diseases and disorders included in this guide. It is important to note, however, that many factors can influence the appearance and severity of symptoms. Many of the photographs are new to this guide. We are grateful to the many academic and private industry individuals who contributed photographs for this guide.
The primary audience for this guide includes tomato crop producers, agricultural advisors, private consultants, farm managers, agronomists, food processors, and members of the chemical and vegetable seed industries. This guide should be used as a reference for information about common diseases and disorders as well as their control. However, diagnosis of these diseases and disorders using only this guide is not recommended nor encouraged, and it is not intended to be substituted for the professional opinion of a producer, grower, agronomist, plant pathologist or other professionals involved in the production of tomato crops. Even the most experienced plant pathologist relies upon laboratory and greenhouse techniques to confirm a plant disease and/or disease disorder diagnosis. Moreover, this guide is by no means inclusive of every tomato disease. Rather, we present those diseases that are currently most prevalent worldwide in protected culture and open field productions.
Always read and follow label directions for any herbicide, fungicide, insecticide or any other chemical used for treatment or control.
A glossary of words used in the text can be found at the end of this guide along with a list of references for additional information on the diseases and disorders addressed within this publication.