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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.
Different species of bacteria affect plants in different ways. Plant symptoms include tip burns, leaf spots, blights, rots, wilts, or the total collapse of plant tissues. The most severe and devastating diseases of foliage plants are caused by bacteria belonging to the genera Erwinia, Xanthomonas and Pseudomonas.