Muhammad U. Yasin, Muhammad Burhan, Azhar Mustafa, Shaukat Ali, Salman Ghaffar, Waseem Abbas, Muhammad Z. Niaz, Tariq Javed


Potato Virus Y has become the most important virus of Potato crop. Various strains of Potato Virus Y has emerged which are affecting the yield of crop and causing economic losses. Due to a conducive climatic conditions for aphid vector the only viable method for control of PVy is identification and cultivation of resistant varieties. Three year’s trial was conducted to identify advance lines and varieties showing resistance towards prevalent strains of Potato Virus Y. PVYO, PVYLD and PVYVN were found most virulent and destructive. No line was found resistant, 3 lines showed moderately resistant response, 5 lines were moderately susceptible, 12 lines was susceptible whiles 2 lines shown highly susceptible response. Incidence and Severity of plants were calculated in field trials and climate data including the averages of maximum temperature, minimum temperature, relative humidity and precipitation was compared with disease development in field trials. Increase in maximum temperature had strong positive correlation with disease severity, while relative humidity and precipitation were negatively correlated with disease development.


Potato viruses; Genetic Recombination

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