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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.
Along with fungi, even bacteria and viruses affect plants. At the same time, some plant diseases are caused by adverse environmental and climatic conditions. There are some plants that have a natural resistance to certain diseases, especially if these diseases and the plants have evolved together.