To prevent or restrict loss from disease, it is necessary to follow a comprehensive corn disease management system. Once the disease has been identified, its control is dependent on an understanding of its cause, the factors that favor the disease, which plant parts are affected, and when the disease organisms are spread. The intent is to disrupt a stage of the normal progress of the disease or eliminate one of the factors necessary for disease development. Some diseases can be eliminated by a single practice such as using a resistant hybrid. However, most diseases require a combination of practices to “stack the deck” against their causing economic damage. Successful disease management requires the application of several control measures. These management decisions are usually made before the crop is planted and are manifest as a long-term reduction in disease losses.
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