Where the results of an annual survey, as provided for in Article 2(1), show the presence of PWN in a susceptible plant in a part of the territory of a Member State in which it was previously not known to occur, or where there is evidence of such a presence by other means, that Member State shall without delay demarcate an area in accordance with paragraph 2, hereinafter ‘the demarcated area’.

Where the presence of PWN is found in the vector or in a consignment of susceptible wood, susceptible bark or in wood packaging material, the Member State concerned shall conduct an investigation in the proximity of where the vector was caught or where the susceptible wood, the susceptible bark or the wood packaging material were at the time of the finding. Where the results of that investigation show the presence of PWN in a susceptible plant, subparagraph 1 shall also apply.

The demarcated area shall consist of a zone in which PWN was found to be present, hereinafter ‘the infested zone’, and of a zone surrounding the infested zone, hereinafter ‘the buffer zone’. The buffer zone shall be of a width of at least 20 km.

Where eradication measures in accordance with Article 6 are applied, the Member State concerned may decide to reduce the width of the buffer zone to no less than 6 km provided that that reduction does not jeopardise eradication.

Where PWN is found to be present in a buffer zone, a new demarcated area shall, without delay, be established in accordance with paragraph 1 to take into account that finding.

The existing demarcated area may, instead, be amended to take into account that finding where that area is subject to eradication measures in accordance with Article 6.

Any evidence of presence of PWN in a buffer zone shall be notified immediately to the Commission and the other Member States.

Where PWN is found to be present in the territory of a Member State and the demarcated area would extend into the territory of one or more other Member States, the other Member State or Member States shall, in accordance with paragraph 1, establish a demarcated area or demarcated areas which complete the buffer zone by a buffer zone or buffer zones whose width correspond to the width of the buffer zone in the Member State of the finding.

Member States shall communicate the demarcated areas in their territory to the Commission and the other Member States within one month from the date on which PWN was found to be present in the area concerned.

That communication shall include a description of the demarcated areas, their location and the names of the administrative entities concerned by the demarcation, accompanied by a map indicating the location of each demarcated area, infested zone and buffer zone.

Member States shall communicate amendments to the demarcated areas in their territory to the Commission and the other Member States within one month of that amendment.

Where the annual surveys of the susceptible plants and the vector, as set out in point 6 of Annex I, show that no PWN has been found to be present in the demarcated area concerned for the preceding four years, the Member State concerned may decide that that area is no longer demarcated. A Member State in the situation referred to in point 5 of Annex I may decide that the area is no longer demarcated in case the absence of PWN is confirmed by the sampling and testing referred to in point 7 of that Annex.

It shall inform the Commission and the other Member States about that decision within one month.

The Commission shall establish a list of the demarcated areas and communicate that list to the Member States.

That list shall be updated according to the communications received by the Commission pursuant to paragraphs 5 and 6.