AN EVALUATION OF SEEDLING PROGENY TESTS FOR RESISTANCE TO POTATO LEAFROLL VIRUS IN POTATO

Progeny tests for resistance to potato leafroll virus using true seedl ings in a glasshouse in Scotland ranked progenies by the percentages o f seedlings showing primary symptoms, in accordance with the known phe notypes of their parents. Symptoms were more obvious in seedlings grow n under sodium lamps than in those grown under fluorescent strip light s. These glasshouse seedling progeny tests were then evaluated by comp aring them with field clonal trials. The progeny tests were found to i dentify effectively those progenies most resistant to potato leafroll virus but were not effective for identifying the most resistant clones within progenies.