author(s)
Attaullah and Muhammad Arif

abstract
Prevalence of major aphid and soil borne viruses infecting potato crop in North Western Pakistan was evaluated during spring and summer crop in 2012-2013. On the basis of field symptoms the average incidence of Potato leaf roll virus (PLRV) ranged from 3.89% (Swat) to 46.66% (Swat), Potato Virus Y (PVY) ranged from 67.04% (Shangla) to 78.95% (Swat) and Potato mop virus (PMTV) ranged from 2.44% (Shangla) to 9.07% (Swat). On the basis of ELISA test average incidence of PLRV was ranged from 8.6% to 44.3%, PVY ranged from 67.0% to 78.9% and PMTV ranged from 2.44% to 9.07%. Field symptoms necrosis, leaf rolling and yellowing and V-shaped chlorosis were shown by PVY, PLRV and PMTV respectively. Field symptoms and serological studies revealed that PLRV, PVY and PMTV were the major viral diseases of potato in the areas surveyed.