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Survey was conducted in five locations of Jorhat district of Assam viz Alengmara, Experimental farm of AAU, Kolbari, Teok and Titabar to determine the incidence of Potato virus Y (PVY) through symptomatology and presence of vector population and the detection of the virus by DAS-ELISA. Symptomatology revealed various degrees of mosaic, mild to severe mottling, distortion of leaves, leaf yellowing and reduction in leaf size. Out of the 321 tested leaf samples 109 samples were found to be positive for PVY showing a per cent infection of 33.95 per cent with highest per cent infection in Kolbari...