Friday, October 17, 2008

Powdery Mildew - UPDATE 17/10/2008

The first signs of Powdery Mildew have been detected.

Small finds of Powdery spots have been seen. This season appears to have low to moderate pressure but this could change with humid overcast weather.

Growers need to keep the developing bunches remain well-protected from infection for at least four to five weeks after flowering.

If you have maintained good spray coverage by then, you are well on your way to harvesting a powdery-free crop.

For conventional farming: If you are in doubt, apply a thorough coverage with either sulphur, or DMI – a Group C fungicide - or a Stroby – a Group K fungicide - or another registered product immediately before and after flowering. If you have been using the same Group C or Group K fungicides for a few seasons in a row consider AVCARE resistance management guidelines. See Resistance guidelines for help.

For organic farming: Increase the frequency of your protection as the vines flower.

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