unfit as seed; (b) the crop is so heavily infested with blights as to render it unfit as seed; (c) met; the isolation distance prescribed in the Second Schedule is not (d) the standard relating to aphids as prescribed in the Second Schedule is not met; (e) the standard relating to the removal from the field of undesirable plants as prescribed in the Second Schedule is not met; or (f) the defect index as prescribed in the Second Schedule is in excess of 30. (2) In respect of every field inspection carried out under these Regulations, a report in the appropriate form prescribed in the Third Schedule shall be rendered by the inspector and counter-signed by the grower. 8. (1) In respect of a crop intended for the production of pre-basic seed Virus post (S) or basic seed (SE), the grower shall give notice to the Certifying control Authority informing him when the haulms have been destroyed and when he intends to lift the potatoes in order that before the potatoes are lifted samples may be taken for purposes of a virus post control. (2) In respect of every virus post control carried out under these Regulations, a report in the appropriate form prescribed in the Third Schedule shall be rendered by the Certifying Authority. 9. (1) Potato seeds shall be graded in three sizes in accordance with the Grading and following specification: packing (a) Small 30-40 millimetres; (b) Medium 41-50 millimetres;