Further provisions relating to citrus propagating material
5. In addition to meeting the requirements of regulation 4, citrus propagating material shall—
(a)have been derived from initial source material which has been checked and found to show no symptoms of any viruses, virus-like organisms or diseases;
(b)have been checked and found to be substantially free of viruses, virus-like organisms or diseases since the beginning of the last cycle of vegetative growth; and
(c)where grafting has taken place, have been grafted on to rootstocks of a kind which are not susceptible to viroids.