This presentation will help consultants, county agents, tomato growers, seed producers, federal and state regulators, and other practitioners in North America and around the world to understand the emerging viroid diseases of tomato, including their distribution, detection, and management. Specifically, in this presentation practitioners will learn about recent viroid disease outbreaks; what viroids are and how they are transmitted through seed and mechanical means; what key factors affect viroid disease epidemics in a greenhouse; technologies in disease diagnosis and viroid detection; and which chemicals are most effective to prevent viroid mechanical transmission. By the end of this presentation, the practitioner should know more about tomato-infecting viroids, including their diagnosis and detection and how to prevent and manage a viroid disease outbreak in greenhouse tomato productions.