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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.
Fungi are one of the living organisms that can cause plant disease and are the cause of about eighty-five percent of all plant diseases. More than 100,000 species of fungi have been classified and include molds, mildews, and mushrooms.owever, the majority of plant diseases are caused by two main groups of fungusâthose from Phylum Ascomycota and Phylum Basidiomycota. Fungi in Ascomycota are commonly called sac fungi and include these species: 1  Diplocarpon rosae â causes black spot on roses. 2  Fusarium spp. â causes fusarium wilt.