The Plant Health Order (Northern Ireland) 2018

19.  The Department may specify in a notice under paragraph 15 that—

(a) any machinery or stores at premises within the demarcated zone which are used for growing, storing or handling potato tubers or tomatoes within the zone, or any premises within the zone from which machinery for potato or tomato production is operated under contract, must be cleansed and, where appropriate, disinfected so that there is no identifiable risk of Potato brown rot surviving or spreading;

(b) in the case of potato crops, only certified seed potatoes or seed potatoes grown under official control may be planted;

(c) potatoes intended for planting must be handled separately from all other potatoes at premises within the zone or that a system of cleansing and, where appropriate, disinfection must be carried out between the handling of seed and ware potatoes;

(d) in the case of tomato crops, only tomato plants grown from seed which meets the requirements of Directive 2000/29/EC or, if vegetatively propagated, tomato plants produced from such seed and grown under official control may be planted;

(e) contaminated surface water must not be used for the irrigation or the spraying of specified plant material and, where appropriate, other host plants of Potato brown rot, without the prior written authorisation of an inspector;

(f) if liquid waste discharges have been contaminated, any waste from industrial processing or packaging premises in the zone which handle specified plant material must be disposed of under the supervision of an inspector.