[Seed dressing according to threshold values: results with summer wheat]
1997
Winter, W. (Eidg. Forschungsanstalt fuer Agraroekologie und Landbau (FAL), Zuerich-Reckenholz (Switzerland)) | Rueegger, A. | Baenziger, I. | Krebs, H. | Frei, P. | Gindrat, D.
In Switzerland the most important seed-borne fungal pathogens of wheat are Gerlachia nivalis (=Fusarium nivale, snow mould), Septoria nodorum (damping-off), and Tilletia caries (common bunt). Field experiments showed that on certified summer wheat seed up to 10 % F. nivale and 30 % S. nodorum can be tolerated without any loss in plant emergence or yield. From our observations and from literature we know that 10 Tilletia caries spores per seed can be tolerated without problems. Seedlots respecting these threshold values can be sown untreated in the plain regions of Switzerland. This would save important amounts of seed fungicides. In the future seed treatment of summer wheat could be pathogen-oriented and the decision whether or not to apply a dressing should be based on threshold values
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