Tobacco plant diseases can be classified as follows:- a) (M physiological disorder connected with deficiency or excess of minerals b) defective cultivation methods and c) parasitic diseases caused by fungi, bacteria, viruses and nematodes. They can also be classified as a) bacterial diseases b) fungal diseases c) virus diseases d) diseases caused by nematodes. Biological control and the use of suitable fungicides, will provide protection against plant disease. A combination of modern technology and adequate extension services is required.