20.—(1) Any person who produces basic seed potatoes or certified seed potatoes shall maintain for a period of not less than 2 years records of purchase of seed potatoes for planting and particulars of the crops grown and of the marketing of the produce of these crops.
(2) Any person who markets basic seed potatoes or certified seed potatoes shall maintain for a period of not less than 2 years thereafter a record of his marketing of such seed potatoes.
(3) Any person who produces or markets basic seed potatoes or certified seed potatoes or otherwise has or has had basic seed potatoes or certified seed potatoes in his possession or in his charge shall if so required in writing by an authorised officer give within 7 days any information he may possess as to the person in whose possession or under whose charge they are or have been and shall produce for examination by an authorised officer any declarations, certificates, labels, records or invoices relating to the planting, classification or marketing of seed potatoes.