|Above: Some sulphur fungicide burn from a Shiraz vineyard sprayed during the hot weather. Note the vines are still growing very rapidly. (c) James Hook|
When applying powdery protection avoid spraying wettable sulfur at high temperatures (35oC) when the humidity is above 70% within 24 hours of spraying.
Growers can opt to use the fungicide Legend (Active Ingredient: quinoxyfen, Fungicide Group: Group 13) in hot weather to avoid sulphur burning. This allows them to keep up the powdery mildew protection on their vineyard. Legend has a 45 day Withholding Period (Vintage 2014). Legend costs $24.40 per hectare at its maximum rate (20ml/100lts) assuming a 1000lt dilute spray volume (DSV).
|Above: Sulphur burn on Frontignac. (c) James Hook|