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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.
The pathogens responsible for these diseases cause non-specific symptoms, namely. stunting, yellowing of leaves, wilting and plant death. Note that these symptoms. can also be caused by some other pathogens as well as stem boring insects, curl. grubs which feed on the roots, and unfavourable soil conditions. These diseases are caused by a number of common pathogens, including fungal. and bacterial pathogens and plant parasitic nematodes.