Abstract

It can be of economic importance for seed potato growers to know the stage of mature-plant resistance of a crop to viruses when aphid flights occur. In 1976 four field experiments were carried out in different parts of the northern Netherlands in which potato plants were artificially inoculated with potato virus YN at four dates. Leaves, tubers and total crop growth were analysed during the growing season to see if a biochemical test could be used to determine the onset of mature-plant resistance. It is concluded that such a test is useful only when used in combination with additional information about early infections. None of the criteria (dry matter, organic nitrogen, chlorophyll and soluble protein contents, and peroxidase activity) proved to be useful in establishing or predicting the time of occurrence of a high level of mature-plant resistance with the desired accuracy.

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