Blogs

Discipline: Grape pathology

Investigator: Mizuho Nita

Title: Virginia Grape Disease Updates

Description: Seasonal updates on wine grape disease management, extension meeting announcements, and other related topics from a grape pathology lab at AHS AREC.

Virginia Grape Disease Updates

Grape Disease Risks: 9/16-23/2026 and Downy Mildew Forecast Grape Disease Risks: 9/16-9/23/2026 NEWA is an Agricultural Weather Station Network, and we are part of the team. Here is a snapshot from last week showing the number of days with risk for each disease: Ph = Phomopsis, PW = Powdery...
Grape Disease Risks: 9/9 – 9/16/2026 and Downy Mildew Forecast Vine Status I heard some growers have seen quite a bit of ripe rot this year. I hope you avoided it! Grape Disease Risks: 9/9-9/16/2026 NEWA is an Agricultural Weather Station Network, and we are part of the team. Here is...
Grape Disease Risks: 9/2-9/9/2026 and Downy Mildew Forecast Vine Status We harvested table grapes today. Some cultivars, e.g., Mars, Faith, Everlest, Neptune, and Joy, had OK harvests despite the frost damage. Grape Disease Risks: 9/2-9/9/2026 NEWA is an Agricultural Weather Station Network, and we are part of the team....
Grape Disease Risks: 8/26-9/2/2026, and Downy Mildew Forecast Vine Status Sooty mold on a Chardonnay leaf due to honeydew produced by the spotted lanternfly. The sugar content in honeydew can promote the growth of certain fungi that might not otherwise appear. Things have slowed down a bit, but...
Grape Disease Risks: 8/19-8/26/2026 and Downy Mildew Forecast Vine Status Our Chardonnay vines are nearing harvest. The only issue is that we only have a few clusters… Grape Disease Risks: 8/19-8/26/2026 NEWA is an Agricultural Weather Station Network, and we are part of the team. Here is a snapshot...
Grape Disease Risks: 8/12-8/19/2026 and Downy Mildew Forecast Grape Disease Risks: 8/12-8/19/2026 NEWA is an Agricultural Weather Station Network, and we are part of the team. Here is a snapshot from last week showing the number of days with risk for each disease: Ph = Phomopsis, PW = Powdery...
Grape Disease Risk: 8/5-8/12/2026 and Downy Mildew Forecast Vine Status The majority of Chardonnay clusters are in the middle of veraison. For some reason, our Merlot dodged the frost, and its clusters started to accumulate sugars. Grape Disease Risks: 8/5-8/12/2026 NEWA is an Agricultural Weather Station Network, and we...
Grape Disease Risks: 7/29-8/5 and Downy Mildew Forecast Grape Disease Risks: 7/29 – 8/5/2026 NEWA is an Agricultural Weather Station Network, and we are part of the team. Here is a snapshot from last week showing the number of days with risk for each disease: Ph = Phomopsis, PW...
Weekly Grape Disease Updates, Seasonal Disease Management Reminders, and a List of short PHI materials. Vine Status We received much-needed rain (~0.9 inches) yesterday! Many Chardonnay, Chardonel, and Vidal clusters are getting soft and approaching veraison. Some others, e.g., Frontenac and many table grapes, are at different stages of veraison. Grape Disease Risks: 7/22-7/29/2026 NEWA is...
Grape Disease Risks: 7/15-22/2026 and downy mildew forecast Vine status Some table grapes started veraison. One early cultivar (Everest, not pictured) had one cluster survive the frost and start to accumulate sugar. Many Chardonnay clusters are at bunch closure. Vidal is at bunch closure; some others, e.g., Chardonel...