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9. An authorised officer may not determine the seed potatoes as meeting the requirements of Union grade PB, if, in relation to the immediately succeeding crop produced from those potatoes, the number of growing plants which—S
(a)deviate from variety and type, is likely to exceed 0.01% of the total number of plants in that crop; or
(b)show symptoms of any virus attributable to infection in the mother crop, is likely to exceed 0.5% of that total number.