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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.
Most plant diseases â around 85 percent â are caused by fungal or fungal-like organisms. However, other serious diseases of food and feed crops are caused by viral and bacterial organisms. Certain nematodes also cause plant disease.ou are not actually seeing the disease pathogen, but rather a symptom that is being caused by the pathogen. Here are a few examples of common signs and symptoms of fungal, bacterial and viral plant diseases: Fungal disease signs: 1  Leaf rust (common leaf rust in corn). 2  Stem rust (wheat stem rust). 3  Sclerotinia (white mold).