UCCE Sonoma County
University of California
UCCE Sonoma County

Photos of Grapevine Red Blotch Disease

Trial Sites

All images in the following table are of specific vines in locations which are under evaluation with grant funding provided by the American Vineyard Foundation. Vines in the photos tested positive for grapevine red blotch associated virus (GRBaV) by PCR-assay. They also tested negative for 20 other grapevine viruses and the bacterium that causes Pierce's disease.

To insure foliar symptoms of grapevine red blotch disease can be associated with a single virus - GRBaV - UC Foundation Plant Services tested all vines using the current "full panel" of PCR assays. As stated above, each vine tested negative for 20 grapevine viruses (including all grapevine leafroll roll associated viruses). Fewer than half the vines tested positive for grapevine rupestris stem-pitting associated virus; a virus that has not been shown to cause significant disease in grapevines.

Photos from Grower Sites are located below the Trial Sites pictures.

Click on the photos to enlarge. Information about each image is included in its file name under the photo.

 
E-mail
 

 Trial Sites

Cabernet
Sauvignon
MerlotChardonnay
Trial Cab Sauv 2013 08 22 IMG_0175
Trial Cab Sauv 2013 08 22 IMG_0175
Trial Merlot 2013 08  07 POS2
Trial Merlot 2013 08 07 POS2
Trial Chard 2013 08 14 IMG_0120
Trial Chard 2013 08 14 IMG_0120
Trial Cab Sauv 2013 08 22 IMG_0178
Trial Cab Sauv 2013 08 22 IMG_0178
Trial Merlot 2013 08  07 POS3
Trial Merlot 2013 08 07 POS3
Trial Chard 2013 08 14 IMG_0126
Trial Chard 2013 08 14 IMG_0126
Trial Cab Sauv 2013 08 22 IMG_0180
Trial Cab Sauv 2013 08 22 IMG_0180
Trial Merlot 2013 08  21 POS1
Trial Merlot 2013 08 21 POS1
Trial Chard 2013 08 14 IMG_0135
Trial Chard 2013 08 14 IMG_0135
Trial Cab Sauv 2013 09 06 IMG_0052
Trial Cab Sauv 2013 09 06 IMG_0052
Trial Merlot 2013 08  21 POS2
Trial Merlot 2013 08 21 POS2
Trial Chard 2013 08 28 IMG_0005
Trial Chard 2013 08 28 IMG_0005
Trial Cab Sauv 2013 09 06 IMG_0053
Trial Cab Sauv 2013 09 06 IMG_0053
Trial Merlot 2013 08 21 POS3
Trial Merlot 2013 08 21 POS3
Trial Chard 2013 08 29 IMG_0012
Trial Chard 2013 08 29 IMG_0012
Trial Cab Sauv 2013 09 06 IMG_0054
Trial Cab Sauv 2013 09 06 IMG_0054
zNtTrial Merlot 2013 08 21 POS4
zNtTrial Merlot 2013 08 21 POS4
Trial Chard 2013 08 29 IMG_0025
Trial Chard 2013 08 29 IMG_0025
   

Symptom severity
in same leaves on
three dates
V
V

   
Trial Chard VINE A 2013 08 29 IMG_0013
Trial Chard VINE A 2013 08 29 IMG_0013
   
Trial Chard Vine A 2013 09 12 IMG_0049
Trial Chard Vine A 2013 09 12 IMG_0049
   
Trial Chard VINE A 2013 09-24 IMG_0192
Trial Chard VINE A 2013 09-24 IMG_0192

 

Grower Sites
All images in the following table are of vines observed in different vineyards and are not under evaluation for the project. Vines in the photos tested positive for grapevine red blotch associated virus (GRBaV) by PCR-assay.  Unless otherwise indicated, vines have not been tested for the presence of other grapevine viruses, thus foliar symptoms of grapevine red blotch disease may be affected by co-infections.

Click on the photos to enlarge. Information about each image is included in its file name under the photo.

 

Grower Sites

Grower Chard 2013 08 21 IMG_0161
Grower Chard 2013 08 21 IMG_0161
Grower Chard 2013 08 22 IMG_0205
Grower Chard 2013 08 22 IMG_0205
Grower Chard 2013 08 28 IMG_0060
Grower Chard 2013 08 28 IMG_0060
Grower Merlot 2013 09 03
Grower Merlot 2013 09 03
Grower Zin 2013 09 09 IMG_0003
Grower Zin 2013 09 09 IMG_0003
Negative for all leafroll viruses:      
Grower Chard #2 2013 09 06
Grower Chard #2 2013 09 06
Grower Cab Franc #2 2013 09 10
Grower Cab Franc #2 2013 09 10
Grower Cab Franc #4 2013 09 10
Grower Cab Franc #4 2013 09 10
Grower Cab Sauv #3 2013 10 27
Grower Cab Sauv #3 2013 10 27
Grower Cab Sauv #4 2013 10 27
Grower Cab Sauv #4 2013 10 27
Positive for leafroll virus-3:      
Grower Chard #1 2013 09 06
Grower Chard #1 2013 09 06
Grower Chard #2 2013 09 06
Grower Chard #2 2013 09 06
Grower Cab Sauv #1 2013 10 27
Grower Cab Sauv #1 2013 10 27
Grower Cab Sauv #2 2013 10 27
Grower Cab Sauv #2 2013 10 27
 

University of California Cooperative Extension, Sonoma County
133 Aviation Blvd Suite 109, Santa Rosa, CA 95403  Phone: 707.565.2621  Fax: 707.565.2623
Office Hours:  M-F, 8am-Noon & 1pm-4pm

Like us on Facebook: UCCE Sonoma                        Follow us on Twitter @UCCESonoma 

Webmaster Email: klgiov@ucanr.edu