In this task, you are provided with an article about the legal acts. Your task is to generate a headline for that article.

This Directive concerns the minimum measures to be taken within the Member States to control Potato Cyst Eelworm (Heterodera rostochiensis Woll.) and to prevent it from spreading. The Member States shall provide that seed potatoes intended for marketing may be produced only on plots which, on official investigation, have been recognised as uncontaminated by Potato Cyst Eelworm. (1) OJ No 28, 17.2.1967, p. 454/67. When an occurrence of Potato Cyst Eelworm is recorded, Member States shall demarcate the contaminated plot. The Member States shall provide that on contaminated plots: (a) no potatoes may be grown;(b) no plant intended for transplanting may be grown, stored in the ground or otherwise. The Member States shall provide that seed potatoes which are contaminated or suspected of being contaminated must, if they are distributed as seed potatoes, be treated in such a way that they are no longer contaminated. The Member States shall revoke the measures taken to control Potato Cyst Eelworm or to prevent it from spreading only if it is no longer found to be present. The Member States shall prohibit the holding of Potato Cyst Eelworm. 1. Member States may authorise: (a) derogations from the measures referred to in Articles 4, 5 and 7 for scientific purposes, tests and selection work;(b) by way of derogation from Article 4 (a), the growing on contaminated plots of varieties of potato which are resistant to pathotypes of Potato Cyst Eelworm found on the plots;(c) by way of derogation from Article 4 (a), the growing on contaminated plots of potatoes other than seed potatoes, provided that it is ensured that such potatoes will be harvested before the cysts of Potato Cyst Eelworm mature;(d) by way of derogation from Article 4 (a), the growing on contaminated plots of potatoes other than seed potatoes, where the ground has been disinfected by appropriate means.2. The Member States shall ensure that the authorisations referred to in paragraph 1 are granted only where adequate controls guarantee that they do not prejudice the control of Potato Cyst Eelworm and create no risk of the spread of this pest.3. A potato variety shall be regarded as being resistant to a particular pathotype of Potato Cyst Eelworm if, when that variety is grown, a natural and annual decrease in the population of that pathotype is found to occur. Member States may adopt such additional or stricter provisions as may be required to control Potato Cyst Eelworm or to prevent it from spreading. 01. The Member States shall communicate to the Commission before 1 January each year a list of all the varieties of potato accepted by them for marketing and which they have found, by official investigation, to be resistant to Potato Cyst Eelworm. They shall state the pathotypes to which the varieties are resistant.2. The Commission shall ensure that a list of resistant varieties, based on the communications from the Member States, is published each year, if possible before 1 February. 1The Member States shall ensure that contamination by Potato Cyst Eelworm and the resistance of potato varieties to this pest are determined by appropriate methods to which Member States raise no objection. 2Member States shall bring into force the measures necessary to comply with this Directive within two years following its notification and shall forthwith inform the Commission thereof. 3This Directive is addressed to the Member States.
Council Directive on control of Potato Cyst Eelworm