Saturday, May 28, 2011

Disease risks from yesterday's and today's rain

Winchester area received thunderstorms yesterday evening around 7 PM; however, air dried out quickly, so, it was probably not long enough as disease risks.  Then we received a light rain around 1 AM.  Once again, it was short and very light, thus, it was not enough for disease infection risks.  However, as I mentioned yesterday, these isolated thunderstorms may have brought longer rains at your vineyards.  Please check your local weather.

Another thing that I noticed is that we have been having two consecutive warm nights with high relative humidity (>90%).  The pathogen of downy mildew tends to sporulate under these night time conditions.

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