On these unusually slow ripening issues

Maybe I should keep posting that rains are coming… Each time I do, it looks like rains disappear. 😉 If you have not subscribed to the email list of Dr.… Read more

List of low PHI materials for Botrytis, powdery mildew, and downy mildew

Well, I was hoping that the rest of the season would be nice and sunny, but I was little naive. Looks like some portion of VA may be affected by… Read more

Last stretch!!

I heard that some of early cultivars are ready to be picked on 7-10 days.  Looks like no tropical storms to worry, yet… (crossing my fingers!) There have been frequent… Read more

Another extensive rain event recorded

As many other parts of VA, we have been experiencing thunderstorms running through our area in the past week for so. Yesterday, we had about 9 hours of wetness with… Read more

A quick reminer on downy mildew

At Winchester, we had 8 hours of wetness observed on last Thursday, then there are several short rains/thunderstorms. Moreover, the night time relative humidity has been fairly high (> 95%)… Read more

Seasonal disease management considerations toward the end of the season.

Most of us are about to finish critical time when clusters are susceptible to infection by downy mildew, powdery mildew, and black rot.  This critical time varies by varieties, but… Read more

An update on yesterday’s post

Just an update on yesterday’s post: At Winchester, AREC, a total leaf wetness hours was 29 hours, with an average temperature of 67F. Thus, this rain event was warm and… Read more

An extensive wetness event recorded (and still going)

A cool and wet Fourth of July weekend resulted in a very long leaf wetness hours. So far, more than 12 hours of wetness has been recorded at Winchester AREC,… Read more

Another reminder on seasonal diseases

Photo: we have started to see powdery mildew on clusters. I hope you are not! Looks like series of thunderstorms are hitting various part of the state this week. Just… Read more

Handout from last week’s meeting + we are still in the critical period!

Here’s my handout from last week’s meeting at Stone Tower Winery. Thanks for those who attended the meeting! It looks like we may have rains here and there this week.… Read more
© 2025 Virginia Grape Disease Updates - Theme by WPEnjoy · Powered by WordPress