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Virginia Grape Disease Updates

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 […]
Phomopsis disease management reminder April 19, 2019
(Phomopsis leaf spot (plus a lesion of black rot), please note the shoot behind the leaf is showing some necrotic lesions which are also caused by the same pathogen)One of the diseases you need to consider this time of the year is Phomopsis cane and leaf spot. It causes minor leaf spots, which is more […]
2019 season has began April 15, 2019
It's approximately 10% bud break on our 10 years old Chardonnay and about 25% on 5 years old Chardonnay. Hopefully, we won't get frosted!!
Presentation slides from this week's grape disease management workshops April 6, 2019
Thank you for attending grape disease management workshops at Loudoun County Extension Office. I really enjoyed the discussions we had. I also appreciate the effort Ms. Beth Sastre puts together for organizing the meeting and translating for 4 hours!!Click here to download the pdf of the slides I used in the workshop. I fixed some […]
Looking for things to do on Friday afternoon? Please join our grape disease management workshop! April 3, 2019
Our next grape disease management workshops are at Loudon County Extension Office. Please RSVP with Ms. Beth Sastre (flores69 (at mark) vt.edu).Por favor únete a nuestro taller de manejo de la enfermedad de la uva! RSVP con la Sra. Beth Sastre (flores69 (at mark) vt.edu).Thursday, April 04, 2019Vineyard IPM Program (1 - 4 pm)Disease management in […]
Presentation slides from PSU Grape disease and insect pest management workshop April 1, 2019
Here are my presentation slides from PSU grape disease and insect pest management workshop. Once again, I am looking for crown gall samples from neighboring states. Please contact me when you have some (dying) vines to spare. I will come and get it. I am planning to visit PA vineyards this summer.1) Late season rots (Botrytis, […]
Presentation slides from UGA Seasonal vineyard and pest management conference March 19, 2019
Here are slides from my presentations at UGA Seasonal Vineyard and Pest Management Conference.1) Ripe rot research updates2) Introduction to trunk disease diagnostic aid app and GrapeIPM.org.FYI: Our next grape disease management meetings are at Loudon County Extension Office. Please RSVP with Ms. Beth Sastre (flores69 (at mark) vt.edu).Thursday, April 04, 2019Vineyard IPM Program (1 […]

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