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15. An authorised officer may not certify any seed potatoes as test and trial seed potatoes if, in relation to the immediately succeeding crop produced from those potatoes, the number of growing plants which—
(a)deviate from variety, is likely to exceed 0.1% of the total number of plants in that crop;
(b)deviate from variety and type, is likely to exceed 0.25% of that total number; or
(c)show symptoms of any virus attributable to infection in the mother crop, is likely to exceed 4% of that total number.