“…With resistance to race 1, to which all the varieties used were susceptible, except for a slight correlation with peroxidase and phenol oxidase, no apparent correlations were found between disease resistance degrees and the factors related to phenols. The experimental results (8,9) formerly reported showed that the phenols content was decreased by about twenty per cent with susceptible tissues infected by P. infestans about a day after infection. Therefore, it seems reasonable that apparent correlations could not be found in this case.…”