Abstract
Common scab of potato caused by the actinomycete Streptomyces scabies is a common pathogen in almost all the potato growing areas of the world. Twenty cultivars of potato were screened in naturally scab infested farmers fields at two locations Tikari and Bachhawan, Varanasi, in two successive crop seasons (2006–2007 and 2007–2008). Among the cultivars, five cultivars were recorded to be least susceptible and the others ranged from medium susceptible to very highly susceptible. Most of the cultivars showed a stable resistance reaction in both the years. Qualitative as well as quantitative estimation of phenolic acids present in peels of the potato cultivars showed their possible role in protection of the potato cultivars against common scab. All the red skinned potato cultivars that were least susceptible to common scab infection were usually found to be rich in phenolic acid contents in their peels. This showed a positive correlation between cultivar resistance to common scab and phenolic acid content in the peel.
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