In this article:
Following suggestions from several viticultural writers that the practice of applying sulfur dust to vines has advantages in addition to controlling powdery mildew, it was decided to investigate the matter further.
In the resulting experiments no significant difference in fresh fruit yields was obtained and difference in dried weights was smaller still. In the absence of oidium, regular sulphuring does not appear to influence yield.
The results suggest any increase in yield as the result of sulphuring can be attributed to its specific action in controlling oidium.
A Note of the Effect of Sulphuring the Sultana Vine
1936, Journal of the Council for Scientific and Industrial Research, vol 9, month 11, pages 313 – 314