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Virginia Grape Disease Updates

Disease management after harvest October 8, 2018
Many of you are about to be done with harvest and some may still have a few more weeks to finish this rainy season. This is a reminder for disease management after harvest.The main reason for you to keep your vines clean after harvest is for winter preparation. Grapevines need to store carbohydrate to survive […]
Spray before the upcoming storm? September 10, 2018
I received several emails and phone calls concerning spray before the upcoming hurricane Florence.Hopefully, we will have a window of opportunity to apply materials. Looks like we have a break from rain starting tomorrow for maybe 1.5 to 2 days.Here is the list of materials with low PHI (same as the one I posted last month).Just FYI: here […]
Reminder: Extension meeting tomorrow! September 5, 2018
Field day: Use of Protective Covers to Reduce Fungicide Usages in (Organic) Wine Grape Production in Virginia5 September 20181 – 4 pmAHS AREC 595 Laurel Grove Rd.Winchester VA 22602 Mizuho Nita, Ph.D, Virginia TechNita24@vt.edu The total acreage of certified organic grape production in the US has increased from 12,575 acres in 1995 to 38,664 acres […]
Late season fungicide options (= materials with short PHI) August 28, 2018
At Winchester, the night time relative humidity has been still very high, close to 100%, in nearly every nights in the past three weeks. In addition, we have been observing rapid development of thunderstorms, pretty much every day in the past few days. I know I sound like a broken record, but these conditions favor […]
Just another reminder on downy mildew August 7, 2018
In the last several days, the nighttime relative humidity has been very high (>90%) and temperature has been in the upper 60s ~ lower 70s. This condition is favoring spore production of downy mildew.Please check my previous post about downy mildew management.
Reminder on downy mildew July 25, 2018
Just a reminder on downy mildew management: although the month of July was dry until this week, many of us had a very wet early summer that fostered downy mildew development. In addition, during the last several days, the night time temperature was in low 70s and RH was 95-99%, which was an ideal condition […]
Handouts from today's sprayer workshop July 19, 2018
Thanks again for coming to today's vineyard meeting. I learned quite a bit!Here are my handouts (sorry for not bringing enough today!!)1) Sprayer calibration handout (will open a PDF file)2) Sprayer calibration aid (spreadsheet)(In order to use it, please download onto your computer [File -> Download as...])3) Seasonal grape disease reminder (will open a PDF file)
Mid-season grape diease management reminders July 8, 2018
Most of us are about to finish the critical time when clusters are susceptible to infection by downy mildew, powdery mildew, and black rot. This critical time varies by varieties, but in general, 4 to 6 weeks and 3-4 weeks from bloom for V. vinifera and V. labrusca species, respectively. After this critical period, you […]
Handout and slides from recent meetings June 19, 2018
Here are my presentation materials from recent meetings. It will open a new window with a PDF file.1) Slides from beginner's workshop on 6 June 2018.2) Handout from the VVA summer technical meeting on 12 June 2018
Upcoming vineyard meeting at Rivah Vineyard June 19, 2018
There will be a meeting in the 23rd of June (Sat) at Rivah Vineyards at The Grove, Kinsale, Virginia. The meeting starts at 6:30 PM. If you are in the Northern neck or surrounding area, please join us.

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