Paragraph 16 Further investigations for the presence of Potato cyst nematodesI1

If any suspected occurrence or confirmed presence of Potato cyst nematodes in Wales results from a breakdown or change in the effectiveness of a resistant potato variety which relates to an exceptional change in the composition of nematode species, pathotype or virulence group, the Welsh Ministers must ensure that the species of Potato cyst nematode and, where applicable, the pathotype and virulence group involved are investigated and confirmed by appropriate methods.