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Grape Pathology lab at Virginia Tech

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Research
Extension
Resources
日本語

Mizuho’s blog

Click to visit Mizuho’s blog for current topics on grapevine disease management information (a new window will open).

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Virginia Grape Disease Updates

Happy New Year and slides from Loudoun County Private Pesticide Certification Course January 2, 2020
Happy New Year!I hope we will have a nice 2020 season.Here are slides from a Private Pesticide Certification course that was held on 17 December 2019 at Loudoun County. The link will open a pdf file in Google Drive.
Virginia Tech is looking for an Assistant Professor - Tree Fruits/Specialty Crop Pathology November 26, 2019
Virginia Tech is looking for an Assistant Professor - Tree Fruits/Specialty Crop PathologyVirginia Tech’s College of Agriculture and Life Sciences is seeking applicants for a tenure track position in Tree Fruits/Specialty Crop Pathology (Job No. 511904) as part of its SmartFarm Innovation Network faculty cluster hire. The cluster hire of 13 new faculty positions will […]
A list of short PHI materials + reminder on downy mildew August 16, 2019
I heard from many that their fruits are ~2 weeks ahead of "average" season, and some early cultivars are already harvested in the southern VA. I should have posted this earlier, but it probably is still applicable to many of us, so, here is a list of fungicides with PHI (Pre-Harvest Interval) equal or shorter […]
Berry touch/bunch closure disease management reminders July 17, 2019
Our Chardonnay clusters are getting larger and berries are starting to touch each other. It feels a bit early, but here are grape disease management reminders at berry touch/cluster closure stage.Botrytis gray mold: The best management practice is canopy management. Botrytis pathogen likes high humidity, thus, the poorly managed canopy that traps humidity will help […]
Sour rot survey July 8, 2019
My colleagues and I are seeking information on sour rot so that we can develop research priorities (and hopefully obtain grants). Many of us suffer from sour rot (remember the last season?), and we need to get our heads together. If you could fill in this short survey, we really appreciate. It should not take […]
Downy mildew reminder July 8, 2019
Of course, once I mentioned the lack of rainfall, we (i.e., northern VA) were hit by a series of rain. To make things more complicated, we had at least three consecutive nights of warm and humid (RH > 90%) condition prior to the rains. Humid nights encourage downy mildew pathogen to produce spores, and rains will splash […]
A quick reminder about powdery mildew July 5, 2019
It depends on where you are, but in northern VA, we are having relatively "dry" weather this summer. We have some rain events here and there, but overall, the air is humid, but not wet. Such a condition promote powdery mildew development, so, I just want to provide a reminder on powdery mildew management.(Powdery mildew […]
Quick reminder: 66-day PHI for mancozeb products June 19, 2019
Just a quick reminder about the 66-day PHI for mancozeb products. If you are thinking about harvest at the end of August or early September, we are getting very close to the limit.You can switch to captan or copper, but these two cannot control black rot, thus, you may need to add a DMI or […]
Handout from yesterday's VVA meeting June 13, 2019
It was very nice to see you all at the meeting. Here's the content of my handout.Seasonal grape disease updatesFor VVA Summer Technical Meeting at Stone Tower Winery12 June 2019Mizuho Nitanita24@vt.eduGrapepathology.blogspot.comThe critical period for cluster infection: Grape clusters are sensitive to infection by powdery mildew, downy mildew, and black rot from the time of bloom […]
At bloom Botrytis and ripe rot management tips May 18, 2019
This is the second part of "at bloom" fungal disease management tips. Please refer to yesterday's post as well.The spray timings for Botrytis is at bloom, bunch closure, and veraison. The pathogen has a wide host range and seems to be active throughout the season, but blooming time is considered as a critical timing because […]

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