CHAPTER I

SUBJECT-MATTER AND DEFINITIONS
Article 1
This Directive establishes the measures to be taken by the Member States against Globodera pallida (Stone) Behrens (European populations) and Globodera rostochiensis (Wollenweber) Behrens (European populations), hereinafter referred to as ‘potato cyst nematodes’, in order to determine their distribution, to prevent their spread and to control them.
Article 2
For the purpose of this Directive, the following definitions shall apply:
1. ‘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. ‘resistant potato variety’ means a variety that when grown significantly inhibits the development of a particular population of potato cyst nematodes;
3. ‘investigation’ means a methodical procedure to determine the presence of potato cyst nematodes in a field;
4. ‘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.
Article 3
1
The responsible official bodies of the Member State shall define what constitutes a field for the purposes of this Directive in order to ensure that phytosanitary conditions within a field are homogeneous as regards the risk of potato cyst nematodes. In doing so, they shall take into account sound scientific and statistical principles, the biology of the potato cyst nematode, the cultivation of the field and the particular production systems of the host plants of potato cyst nematodes in that Member State. The detailed criteria for the definition of a field shall be officially notified to the Commission and to the other Member States.
2
Further provisions related to the criteria for the definition of a field may be adopted in accordance with the procedure referred to in Article 17(2).