Stem injection of triazoles for the protection of <i>Vitis vinifera</i> L. (‘Riesling’) against powdery mildew (<i>Uncinula necator</i>)


  • A. Düker
  • R. Kubiak



fungicide, powdery mildew, stem injection, triazole, viticulture, xylem


The aim of this study was to find suitable substances to control powdery mildew by means of stem injection. The triazoles myclobutanil, penconazol and tebuconazol were used as test substances. In the first experiment, single xylem injections of these triazoles were carried out to test their effect against powdery mildew. The injections were carried out on field-grown grapevines using the ChemJet® tree injector. Applications invariably yielded efficiency factors of over 60 %. A practiceoriented effect on leaves and grapes was most notably gained using tebuconazol. In the second experiment, the repeated xylem injection of myclobutanil, penconazol and tebuconazol was carried out on field-grown grapevines with a prototypal stationary injection system to evaluate the longer-term effects. Grapevines sprayed with formulated myclobutanil (Systhane 20 EW®), penconazol (Topas®) and tebuconazol (Folicur 250 EW®) enable the methods to be compared. Applications using the prototypal stationary injection system only yielded moderate efficiency factors. A practice-oriented effect was gained using the sprayed application. Future options for stem injection, such as combating wood-destroying fungi and phytoplasmosis, were discussed.