DRY‐ROT DISEASE OF THE POTATO

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Abstract
By combining the results of the standard laboratory injection test and a riddle‐abrasion method of inoculation, both carried out at different periods of the year, a susceptibility index for a number of commercial potato varieties grown on the same soil was obtained, using the variety Catriona as a standard. None of the varieties tested was immune from the disease.The reactions of certain varieties were found to differ in both tests and in a few, e.g. Golden Wonder, this is believed to be caused by differences between ‘physiological’ susceptibility, i.e. that of the tuber flesh, and ‘mechanical’ susceptibility, i.e. where liability to abrasion is also involved.A method for assessing skin abrasion is described.The rate of development of rotting was found in some cases to be independent of the final susceptibility index.

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