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A plant disease cannot develop if a susceptible host, pathogen, and favorable environment do not occur simultaneously. The disease cycle describes the interaction of the pathogen with the host. Knowing the disease cycle is the foundation for plant disease management. Although we have four types of pathogens that can cause disease on plants, the disease cycle is essentially the same for all of them. The most effective disease management strategies break the disease cycle. Understanding the disease cycle and how management strategies break the disease cycle will enable the most effective strategies to be used for plant disease management. This video talks about managing plant diseases.