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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.
In most cases, scientists have been unable to find cures for plant viruses, so they have been focusing on reducing the occurrence and transmission of the viruses. Viruses are not the only plant pathogens. Infectious particles known as viroids and satellite viruses cause several plant diseases as well.he name of the plant disease is often related to the symptoms the disease produces in the particular plant. For example, papaya leaf curl and potato leaf roll are diseases that cause specific types of leaf distortion.