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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 tree diseases are caused by fungi which thrive during moist, warm weather common at the start of the growing season. Properly timed disease treatments can prevent the production, growth and spread of spores that cause tree diseases.ost tree diseases are caused by fungi which thrive during moist, warm weather common at the start of the growing season. Properly timed disease treatments can prevent the production, growth and spread of spores that cause tree diseases.