Tuesday, December 8, 2009

Downy Mildew Secondary Event in the Adelaide Hills.




Above: Downy Mildew Oilspots as found in Woodside, yesterday the 7th of December.

CropWatch Adelaide Hills reports a Downy Mildew Secondary Event (warm, wet night) on the 8th of December. Balhannah received 8mm of rain last night in the four hours before dawn. This will cause Downy Mildew to spore and spread in unprotected vineyards.

What does this mean for Adelaide Hills vineyards?

Your fruit is immune to Downy infection once berries are appx. 2-5mm in size but leaves (and berry stems) remain at risk until harvest.

There is a low risk of Adelaide Hills grape growers losing bunches to Downy Mildew. CropWatch is more concerned about of further warm wet nights through December and January causing a build up of Downy Mildew Oilspots on vine leaves causing defoliation.

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