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Nita lab

Grape Pathology lab at Virginia Tech

Research
Extension
Resources
日本語

Research
Extension
Resources
日本語

Foliar Symptoms

Click/tap the photo that best resembles the symptom.

Marginal Burning/Scorching

(Photo credit: Mizuho Nita)

Tiger Striping

(Photo credit: Mizuho Nita)

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Virginia Grape Disease Updates

Grape Disease Risks: 9/24-10/1/2025, an 8-day downy mildew forecast, and slides from the previous meeting – last weekly update for the season. October 2, 2025
Grape disease risks from the NEWA Here is a snapshot 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...
Grape Disease Risks: 9/17-9/25/2025, and an 8-day downy mildew forecast September 25, 2025
Grape disease risks from the NEWA Here is a snapshot 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...
Grape disease risks 9/10-17, and ~8-day downy mildew forecast September 19, 2025
Grape disease risks from the NEWA Here is a snapshot 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...
Grape disease risks: 9/4 – 9/10/2025 and 8-day downy mildew forecast September 10, 2025
Grape disease risks from the NEWA Here is a snapshot 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...
Grape disease risks: 8/27-9/3/2025, an 8-day downy mildew risks, and upcoming AHS AREC Events September 3, 2025
Grape disease risks from the NEWA Here is a snapshot 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...
Grape Disease Risks: 8/20-8/27, and an 8-day downy mildew forecast August 28, 2025
Grape disease risks from the NEWA Here is a snapshot 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...
Grape Disease Risks 8/13-8/20/2025, and an 8-day downy mildew forecast August 21, 2025
Grape disease risks from the NEWA Here is a snapshot 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...
Grape Disease Risks: 8/7 – 8/13/2025 and an 8-day downy mildew forecast August 13, 2025
Grape disease risks from the NEWA 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....
Grape Disease Risks: 7/30-8/6/2025, an 8-day downy mildew forecast, and slides from today’s meeting August 7, 2025
Grape disease risks from the NEWA 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....
Grape Disease Risks: 7/23 – 7/30/2025 and an 8-day downy mildew forecast July 30, 2025
Grape disease risks from the NEWA 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....

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