Potato production occupies an important place in the agriculture of the Community.

Satisfactory results in potato cultivation depend to a large extent on the use of appropriate seed potatoes.

It is desirable to establish a uniform certification scheme for the Community based on the experience gained in the application of schemes in the Member States and that of the Economic Commission for Europe. In the context of the consolidation of the Internal Market, the Community scheme should cover the production of seed with a view to marketing and to marketing within the Community, and should offer no possibilities for the Member States to derogate unilaterally in a way that would hinder the free movement of plants within the Community.

As a general rule, seed potatoes should be allowed to be marketed only if they have been officially examined and certified, in accordance with the rules for certification, as basic seed potatoes or certified seed potatoes. The choice of the technical terms ‘basic seed potatoes’ and ‘certified seed potatoes’ is based on already existing international terminology. It should be possible, under specified conditions, to place on the market bred seed potato of generations prior to basic seed potato and seed potato as grown.

Member States may subdivide the categories of seed potatoes into grades satisfying different requirements. It seems appropriate to provide that Community grades and their requirements may be established in an accelerated procedure. In this respect it should be left to Member States to decide the extent to which they apply these grades to their own production.

In the light of modern advances in propagation techniques, it is appropriate to lay down a Community procedure for the establishment of specific rules applicable to the marketing of seed potatoes produced by techniques involving micropropagation.

Community rules should not apply to seed potatoes shown to be intended for export to third countries.

In order to improve not only the genetic value and health status of Community seed potatoes but also their external characteristics, provision should be made for tolerances in respect of impurities, blemishes and diseases in seed potatoes.

Member States may be authorised, in respect of the marketing of seed potatoes in all or part of their territories, to take more stringent measures than provided for in Annex I against particular virus diseases which do not exist in those regions or which appear particularly harmful to crops in those regions. It has appeared that the scope of this provision should be extended to harmful organisms other than virus diseases.

In order to ensure the identity of the seed potatoes, Community rules on packaging, sealing and marking must be established. To this end the labels should give the particulars needed both for official verification and for the information of the user and should clearly show the Community nature of the certification.

Rules should be introduced on the marketing of chemically treated seed potatoes, seed potatoes suitable for organic growing and on the conservation of genetic resources of plants in the interest of conservation by use in situ of varieties threatened with genetic erosion.

Derogations should be permitted under certain conditions, without prejudice to the provisions of Article 14 of the Treaty. Member States making use of the derogations should assist each other administratively as regards inspection.

In order to ensure that both the requirements as to the quality of the seed potatoes and the provisions for ensuring their identity are complied with during marketing, Member States must make provision for appropriate control arrangements.

Seed potatoes satisfying these requirements should, without prejudice to Article 30 of the Treaty, be subject to no marketing restrictions other than those provided for in Community rules, except in those cases where Community rules provide for tolerances in respect of diseases, harmful organisms or their vectors.

Provision should be made for authorising the marketing within the Community of seed potatoes harvested in third countries only if they afford the same assurances as seed potatoes officially certified within the Community and complying with Community rules.

During periods in which there are difficulties in obtaining supplies of certified seed potatoes of the various categories, seed potatoes satisfying less stringent requirements should temporarily be permitted to be marketed, as well as seed potatoes belonging to varieties not included in the Common Catalogue of varieties nor in the National Catalogue of Varieties.

In order to ensure that seed potatoes certified in the Member States satisfy the requirements laid down and to enable comparisons to be made in the future between such seed potatoes and those coming from third countries, Community comparative tests should be established in Member States to permit annual post-control of the various categories of certified seed potatoes. The Member States should be authorised to prohibit the marketing of all or certain varieties of seed potatoes coming from other Member States if the comparative tests have given unsatisfactory results over a period of several years.

It is desirable to organise temporary experiments for the purpose of seeking improved alternatives to certain provisions set out in this Directive.

This Directive should not affect the obligations of the Member States concerning the deadlines for transposition of the Directives set out in Annex IV, part B,