For the purpose of this Directive, the following definitions shall apply:

1. (a)

   ‘official’ or ‘officially’ means established, authorised or performed by the responsible official bodies of a Member State as defined in Article 2(1)(g) of Directive 2000/29/EC;

2. (b)

   ‘resistant potato variety’ means a variety that when grown significantly inhibits the development of a particular population of potato cyst nematodes;

3. (c)

   ‘investigation’ means a methodical procedure to determine the presence of potato cyst nematodes in a field;

4. (d)

   ‘survey means’ a methodical procedure conducted over a defined period of time to determine the distribution of potato cyst nematodes in the territory of a Member State.