Aspects of the sustainable use of Wettable Sulfur against Powdery Mildew (<em>Erysiphe necator</em>) on grapevine with respect to organic vine growing

Abstract

Sulfur is well known as an effective agent against Oidium (Erysiphe necator) on grape vine. For ecological vine growing it is absolutely essential. Nevertheless there are some reports about low efficacy when using the registered doses.

With respect to the use of Wettable Sulfur 80 WG this paper illustrates the different situations of registration in some European countries in comparison to the product doses registered in Germany. Comparing the different registrations allows a broader perspective and may point out options for improving the current dosing system and adapting the doses in growth stages of high sensitivity against the fungus. This approach contributes to a sustainable use of sulfur as required by European legislation and National Action Plans as well. In addition to its relevance for ecological wine growing Sulfur is most important as tool for strategies of prevention of fungicide resistance. The paper outlines the need and consequences of a change of the unit of dose from kg/ha ground area to kg/10 000 m² leaf wall area for Wettable Sulfur.

DOI: 10.5073/JfK.2014.05.03, https://doi.org/10.5073/JfK.2014.05.03