Cassava (Manihot esculenta erantz) is the third most important food crop after cereals and grain legumes. The crop suffers from wide variety of diseases caused by virus, fungi and bacteria. On global basis, cassava mosaic disease in most widely spread and forms the major limiting factor in the cassava production.. Bacterial blight is a devastating disease whichcause complete yield loss.The fungal diseases include tuber rots, stem rot, dieback and leaf spots. In India cassava mosaic and tuber rot are the two major diseases which are considered as major constraints in the cultivation of the crop.