Qualitative und quantitative Analyse der Biosaatgutproduktion bei Getreide in Österrreich
2009
Weinhappel, Manfred | Leonhardt, Charlotte | Hartl, Dr. Wilfried | Diethart, Ivoneta
In the scope of a research project, official data from the certification of organic seed in Austria from 1999 to 2007 were analysed to determine the most important factors effecting seed quality and leading to rejection of certification. Data from 4684 seed multiplication fields and 3262 seed lots were analysed. Weed seeds and wild oats (Avena fatua) have little effect on the quality of finished seed due to highly effective seed processing plants and risk-based seed testing. In cereal seeds the most frequent reason for rejection of certification in the category Other Seeds by Number is Other Cereal Seeds. An important criterion resulting in frequent non-certification of organic seed is the level of infection from seed-borne and seed-transmitted diseases. Although the field inspection data show only a very small number of multiplication fields with evidence of relevant seed-borne diseases, those diseases were nevertheless identified at a higher rate in the finished seed lots. Especially loose smut (Ustilago nuda) and leaf stripe (Drechslera graminea) on spring barley as well as bunt (Tilletia caries) have been increasing in Austria during the period studied. The main reasons for this development were nearby fields that harboured these diseases due to use of poor quality farm saved seed.
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