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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.
Organisms that cause continued irritation (disease) include viruses, bacteria, fungi, parasitic plants, and nematodes (Figure 1). Plant diseases are almost always caused by fungi and rarely caused by bacteria.In people this fungi-to-bacteria ratio is reversed.rganisms that cause continued irritation (disease) include viruses, bacteria, fungi, parasitic plants, and nematodes (Figure 1). Plant diseases are almost always caused by fungi and rarely caused by bacteria.