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Virginia Grape Disease Updates

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 […]
At bloom disease management tips May 17, 2019
Many people in northern VA are about to see blooms in a few weeks, and I am sure the rest of the regions are about to see bloom very soon. Bloom is a start of the critical time for cluster infections by downy mildew, powdery mildew, and black rot. Bloom time is also the critical […]
Early season fungicide application reminders May 5, 2019
It has been another rainy weekend (1.5 inches so far and still counting), and looks like next weekend will be wet again... Hopefully, this year won't as wet as the 2018 season...Hopefully, you can provide good protection before the rain, but even if you did, rain more than 1-2 inches can wash the material away […]

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