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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.
Parasitic Diseases & Plant Pathogens That Cause Them. The bulk of this program concentrates on those plant health problems that are caused by pathogenic microorganisms. These organisms include fungi, bacteria, and viruses. About 85% of all plant diseases are caused by fungi.Therefore, on a statistical basis alone, you are likely to encounter fungal diseases much more often than those caused by other types of pathogens.hese organisms include fungi, bacteria, and viruses. About 85% of all plant diseases are caused by fungi. Therefore, on a statistical basis alone, you are likely to encounter fungal diseases much more often than those caused by other types of pathogens.