Thursday, October 14, 2010

Powdery Mildew - Notes on control

The message about Powdery is repetitive but effective. Get good coverage on your vineyard between now and the end of flowering!

The good news is that well protected vineyards remain clean of Powdery Mildew. 

Powdery Mildew Flagshoot.

The weather this week has been good for the development of Powdery. Mild temperatures (20 – 25oC) & cloudy conditions are excellent for the disease to produce spores and spread on unprotected leaves and inflorescences. High humidity and poor airflow will also favours its spread.

Powdery starts from a low level and steadily increases in vineyards without good protection. Monitoring for the disease is difficult, and if protection is not adequate powdery levels can catch growers unawares.

The recent vine growth means that the canopy is beginning to close up and vines are becoming progressively harder to spray. Calibration and set-up of vineyard sprayers is critical at this time.

It is worthwhile checking areas of your vineyard where powdery has been a problem in the past for any signs of powdery development this season.

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