Wednesday, December 1, 2010

Powdery Mildew Pressure is very high - UPDATE 12/1/2009

Humid and warm weather conditions are causing vineyards to be at a high risk of developing Powdery mildew infections.

Powdery mildew has been spreading this week. Most monitored Chardonnay vineyards now have some signs of the disease.

Flag-shoots have been detected in blocks within the district. Cleistothecia infections have developed further with large, shaded, humid canopies aiding the development and spread of the disease (below).







If there is any sign of Powdery in your vineyard, apply two sprays of a suitable registered fungicide at 10-day intervals in attempt to stop the disease increasing. For Powdery protection avoid spraying wettable sulfur at high temperatures (>35oC) when the humidity is >70% within 24 hours of spraying. Growers can opt to use Legend in hot weather to avoid sulfur burning. This allows them to keep up the protection on your vineyard.

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