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Virginia Grape Disease Updates

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.
Location for tomorrow's VVA Summer Meeting June 12, 2018
A few people asked me about the specific location for tomorrow's VVA summer technical meeting. The meeting will be held at Brown Bear vineyards (Formally Spring Hills), and the nearest address is: 229 Spring House Lane, Woodstock VA 22664.Tremain prepared a set of screenshots to help you get there. (Click the images to expand)Spring House Lane […]
Don't forget about powdery mildew! June 6, 2018
Powdery mildew colonies at the center of two leaves in the pictureWith this wet season, what we think most are downy mildew, black rot, Phomopsis, and Botrytis. Powdery mildew is often associated with a dry season, partially because this pathogen does not require rain for its infection process.However, what they also like to do is […]
Bloom time fungicide application suggestions May 27, 2018
Although our bud break was about two weeks behind of a typical year, the wet and hot May pushed our vines forward rather quickly. Many people in northern VA are about to see blooms (our 3-year old young Chardonnay vines are trace bloom), and I am sure rest of regions are going through bloom by […]
More about options for current rainy situation May 17, 2018
I have added more information to the yesterday's post. Please check it out.Options against current rainy condition.

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