As of 12pm, Thursday the 6th of November the forecast weather is not suitable for a Downy Event for McLaren Vale. While an alert has been reported on radio via the Bureau of Meteorology, we believe the amount and the duration of rain is not enough to cause a 10:10:24 Downy Mildew Primary event. The Bureau reports rain beginning 3am and clearing Friday morning. There is an 80% chance of 5-10mm. Showers are expected Saturday and a possible shower Sunday.
If we are correct no action is required for Downy Mildew in grapevines.