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 4/16-4/23/2025 Here are snapshots from the last week, showing the number of days with the risk of each disease: Ph = Phomopsis, PW = Powdery mildew, BR = Black rot, and DM = Downy mildew. N/A means there is no data...
Grape Disease risks 4/10-4/16/2025 Here are snapshots from the last week, showing the number of days with the risk of each disease: Ph = Phomopsis, PW = Powdery mildew, BR = Black rot, and DM = Downy mildew. N/A means there is no data...
Grape Disease risks 4/5-/9/2025 and Slides from today’s meeting Here are snapshots from the last week, showing the number of days with the risk of each disease: Ph = Phomopsis, PW = Powdery mildew, BR = Black rot, and DM = Downy mildew. N/A means there is no data...
Early Season Grape Disease Management Reminders Phomopsis cane and leaf spot One of the diseases you need to consider soon after bud break is Phomopsis cane and leaf spot. It causes minor leaf spots, which are more evident to our eyes, but necrotic lesions cause more...
VCE Viticulture Winter Workshop Registration Links and Pest Management Guides I have new links for registration. Please use the following links. Registration: For the pruning workshop (2/21), please contact Ms. Beth Sastre. For the First Grape Disease Management Workshop (3/6), please contact Ms. Kim Bryant. Grape IPM Workshop 3/14 – https://pears.io/events/vce/127/...
Save the date: VCE Viticulture Winter Workshops 2025 The Virginia Tech viticulture team (Drew, Tremain, and I) will hold a series of workshops where we will discuss these diseases in depth. Please attend one of these so that you can better prepare for the 2025 season. Some of...
A link to the EPA public comment site, mancozeb survey, and slides from yesterday’s online meeting. Federal regulation re-evaluation for mancozeb and malathion The EPA is reevaluating the uses of mancozeb and malathion this time, and their proposed action is to eliminate mancozeb from grapes. To counterbalance this initiative, the EPA is now offering a comment...
Grape Disease Risks 8/21 – 8/28/2024 Here are snapshots from the last week, showing the number of days with the risk of each disease: Ph = Phomopsis, PW = Powdery mildew, BR = Black rot, and DM = Downy mildew. N/A means there is no data...
Grape Disease Risks: 8/14-8/21/2024 Here are snapshots from the last week, showing the number of days with the risk of each disease: Ph = Phomopsis, PW = Powdery mildew, BR = Black rot, and DM = Downy mildew. N/A means there is no data...
Grape Disease Risks: 8/7-8/14/2024, Slides from last week, and a List of short PHI fungicides. Here are snapshots from the last week, showing the number of days with the risk of each disease: Ph = Phomopsis, PW = Powdery mildew, BR = Black rot, and DM = Downy mildew. N/A means there is no data...