VASCM: Red Blotch in Our Region; Upcoming Meeting on Diagnosing Canopy Problems

[Mary Lindsay]

Red Blotch has been reported in a few of our local vineyards. And 
nursery stock coming in to our region has been tested positive for Red 
Blotch. This may have seemed like a distant issue, but it has come 
closer. If you haven't already you may want to find out more about this 
virus.

In an article in Wine Industry Advisor earlier this week, Judit Monis of 
STA Labs in Gilroy provides some details, including:

- Presently there is no information on the natural transmission of GRBaV 
other than *it is graft transmissible and propagated with infected 
rootstock and scion cuttings*.  While there are anecdotal reports that 
GRBaV is spreading rapidly throughout California vineyards, there is 
limited field data supporting this viewpoint.

- The virus is associated with the presence of red, blotchy leaves and 
reduced sugar content in red fruited grape varieties.  And also affects 
white grapes.

- It is likely that Red Blotch disease was confused with other grapevine 
disorders that manifest similar symptoms. These disorders include 
infection by leafroll viruses or fungal pathogens, insect feeding 
damage, vine nutritional deficiencies, environmental stresses, soil 
conditions, physical damage, poor vineyard management, etc.

You can read the articlehere 
<http://www.wineindustryadvisor.com/2015/07/28/update-grapevine-red-blotch-associated-virus/>. 
And below is information about a free webinar on Aug. 20.


*Upcoming VASCM Meeting:*  We are planning a VASCM meeting in August 
(hopefully before harvest starts) on “Diagnosing Grapevine Canopy 
Symptoms” (date and location TBD). Larry Bettiga, UCCE Farm Advisor, 
will address the identification of a range of canopy issues including 
disease (virus, fungal), pest, nutrient deficiency, etc.  More 
information will be forthcoming.

Cheers!
- The VASCM Board






		


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      *JOIN US FOR A COMPLIMENTARY WEBINAR!*


      Update on Grapevine Clean Planting Stock - Diseases of Concern
      Presented by Judit Monis, Ph.D., Plant Health Services, Eurofins
      STA Laboratories

The California Grapevine Registration and Certification (R&C) Program 
was revised in 2010.  The regulations, coined as “Protocol 2010,” 
include specific rules for traceability, distance of increase blocks 
from commercial fruit-bearing (non-registered) vineyards, and disease 
diagnostic with vines propagated using a tissue culture technique with 
the aim of eliminating harmful viruses.  The webinar will discuss 
details of the “Protocol 2010” disease testing and provide an update on 
the recent discussions to include /Grapevine red blotch associated 
virus/ (GRBaV) in the California R&C program.  Furthermore, we hope to 
highlight the need for growers and nurseries to develop routine testing 
programs to complement the current and future R&C diagnostic programs in 
order to avoid the potential transmission and spread of pathogens.


      <http://info.eurofinsus.com/CTB00Z0JL0aN0QpL0602R05>

		

*WEBINAR DETAILS*


      *Title*: Update on Grapevine Clean Planting Stock - Disease of Concern
      *Date*:Thursday, 8/20/15
      *Time*:11:00AM-12:00PM PDT


PRESENTER DETAILS

Judit

Judit Monis, Ph.D.
Plant Health Services Division Manager
Eurofins STA Laboratories, Gilroy, CA


	
*Eurofins STA Laboratories
*7240 Holsclaw Road, Gilroy, CA 95020
Phone: 408-846-9964
<http://info.eurofinsus.com/T0QNa0B02000LTK00L56pR0>www.eurofinsus.com/grapevine-testing

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