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Most plant diseases are caused by fungi, bacteria, and viruses. Although the term disease is usually used only for the destruction of live plants, the action of dry rot and the rotting of harvested crops in storage or transport is similar to the rots of growing plants; both are caused by bacteria and fungi.
Disease. Some plant diseases can cause wilting. For example, Fusarium and Verticillium fungi live in the soil and affect many plants, including tomatoes and other vegetable crops. The fungi enter a plant through the roots and cause wilting as they prevent water from reaching the leaves. Fusarium-infected plants at first might wilt on only one side, according to the University of California Integrated Pest Management Program. To control these diseases, remove and destroy infected plants.