SUMMARY In a trial of over 2000 potato plants 11 ‐8% of them were found to be infected with potato leaf roll virus. Infection caused reduction in the number of stems and reduced the number, weight and mean weight of both chats and ware tubers produced per hill. It also reduced the number and weight of ware tubers produced per stem. The health status of neighbouring plants was found to influence the weight and mean weight of ware tubers of healthy, but not of infected plants. This yield compensation is described in an appendix.
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Richard Killick (1979) studied this question.