At Winchester area, the second series of rain started around 5:20 pm on Sunday, then it continued on and off until around 8:30 pm on Monday with about 0.17 inches of precipitation. Thus, there was about 27 hours of wetness with average temperature of 58F or so. It was long and warm enough for Phomopsis, and Black Rot to cause infection. Also, these rains from Saturday probably initiated ascospore release of powdery mildew. (Powdery mildew does not require water for its infection, but it requires water to release ascopsores from its over-wintering structure.) The average temperature was low for downy mildew, but between noon to 5 pm Monday, we observed 60-65F while it's raining. Thus, it might be accounted for downy mildew as well.
I hope you and your family have a good holiday season and a Happy (and safe) New Year! Thanks again for your support of our programs. Here are some recent media highlights. 😉 The link will open a new window. AHS AREC promotional video that highlights some of our activities. The link did not work... It asks you to log in to VT. I will request the IT people to change the setting, but in a meantime, here's the same video. We also appeared in the Library of Congress project “Winery Workers of Virginia”. One more announcement: I will be moving this blog to a new location ( ext.grapepathology.org ) early next year. I had to make a change due to the email subscription service, which has been terminated. You do not need to change your bookmark or your email subscription. The URL will be forwarded to a new site and your email subscription has been moved to a new site already.
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