Nita lab

Grape Pathology lab at Virginia Tech

Research
Extension
Resources
日本語

Research
Extension
Resources
日本語

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Virginia Grape Disease Updates

Prepare for a potential rain event for this weekend. August 24, 2020
Looks like a tropical storm Marco is moving westward, but Laura may hit our areas during this weekend. The current forecast shows (opens a new window with a link to Weather.com) potential movement to Virginia and surrounding states around this Saturday (8/29). Many white cultivars will be either ready to pick or getting very close […]
Downy, Botrytis, sulfur burn, and open house August 14, 2020
With recent rain events and warm and humid nights, the risk of downy mildew and Botrytis are probably high in many areas of Virginia. For example, I counted seven days (at Winchester, VA) and eleven days (at Rustburg and Scottsville, VA), with downy mildew infection events in the past two weeks according to the NEWA […]
Presentation slides and a list of short PHI materials. July 28, 2020
Thanks for attending today's online Extension meeting.Please find the materials I discussed today below.1) Presentation slides (will open a new window with a pdf file).2) List of short PHI materials for Botrytis, powdery mildew, and downy mildew.
Recent rain events and downy mildew spray July 23, 2020
Central and northern VA received much-needed rains in the past two days. Looks like the chance of thunderstorm is high in today and tomorrow too. Several people asked me whether they need to jump on their tractor now and spray for downy mildew or not.Here are snapshots of downy mildew risk events in three locations […]
Disease risk events from last two weeks and quick reminders July 10, 2020
Here are snapshots from the NEWA risk models from the past two weeks.Floyd: no black rot or downy mildew infection eventsAfton: black rot and downy mildew infection event on 7/1-2.Winchester: downy mildew infection event on 7/8Looks like we are having relatively dry conditions. Depends on where you are and which cultivar you grow, you may […]
Rains and fungicide sprays June 21, 2020
It looks like we will see a series of rain events in the next few days. As noted in the previous virtual viticulture meetings, we had several black rot and downy mildew infection events in the past two weeks, and some people start to see the development of these diseases.Some growers asked me how long […]
Slides from a virtual vineyard meeting, 18 June 2020 June 18, 2020
Thanks for all who were able to make it to our virtual meeting this afternoon!The file below is the slide set I used today, the link will open a pdf file in a new window.Critical time *very quick* grape disease management reminders - please see the previous two presentation slides for more information! 1) June 4th […]
Presentation slides from 4 June 2020 virtual meeting June 4, 2020
Thanks for all who were able to make it to our virtual meeting this afternoon.The file below is the slide set I used today, the link will open a pdf file in a new window.Grape disease management reminders, 4 June 2020
Presentation slides from PSU webinar May 27, 2020
Thank you for those of you who were able to join the webinar today. You can access the slides from today from the link below (will open a new window with a pdf file).PSU Grape management reminders from bloom through bunch closure (5/27/20)Please see this posting for how to access the Google sheet that I […]
Video recordings from recent online grape pathology workshops May 22, 2020
It took a while, but I think I figured out how to share the recodings. If you click the line below, each opens a new window with the video recording of the workshop. If you are wondering why I am pausing here and there, I was reading questions from the chatbox.1) GrapeIPM.org short training and […]

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