A research project started in Austria in 1993/94 by ARC Seibersdorf (Austria Research Center ULB Umwelt-, Lebenswissenschaften- and Biotechnology) and VitroPlan GmbH aims at the gradual planting of certified vines the quality of Austrian wines is significantly improved (the first phase was completed in 2001). The background to this are several EU directives, the implementation of which led to the "Austrian Reb Traffic Law 1995". The aim is that in the future the seed will meet defined quality criteria, and that it is above all free from defined diseases. Many vines have latent infections that occur in the vegetative propagation and finishing be disseminated.
In some cases, these diseases only have an effect on quality and yield after many years and shorten their lifespan and profitability. These include above all virus and bacteria which can cause many vine plant diseases, for example wood diseases (see under Rugose Wood Complex ). There were 200 Clones the most important Austrian varieties collected, tested for viruses and bacteria with various methods and subjected to a thermo-virus-free method. All conspicuous clones were eliminated. About 40 clones of 25 grape varieties (that is 30%) met the health criteria and could be included in a priority list.
The selection was made by a panel of experts and representatives of Austrian viticulture. There is a certain amount of white wine. The latest trends in the increasing importance of red grape varieties were not fully apparent at the time of clone selection, and extension in this direction would be desirable. Actually over 300 clones were tested, but not all of them went through the full program. However, a potential of 25 to 30 additional clones can be used at which the tests are completed and which meet the required criteria of plant health. However, these were not (yet) taken into account in the preparation of the priority list.
The different clones of grape variety are each varieties and can play a significant role in the flavor of a variety-typical bouquet and the optimal adaptation to local conditions. In France, special attention is paid to the preservation of clone diversity, where important varieties with more than 300 clones are represented. The conservation and future propagation of important varieties should always be based on several clones. As a result of the implementation of the EU Guideline for the Certification of Planting Material, there are only more certified vineyards in Austria in 30 to 40 years; possibly at the expense of autochthonous developed clone variety. See also below Vine enemies,