I have a little new info about research on Red Blotch from Deborah Golino, Ph.D., the director of Foundation Plant Services at UCD:
First, the Red Blotch Disease area on the UC Intergrated Viticulture website has a number of useful publications and news releases on the subject. It will be kept up to date as new information is available.
In addition, on March 27, a special webinar Grapevine Red Blotch Disease: An Emerging Issue was held, moderated by Tim Martinson, Senior Extension Associate at Cornell University. Cornell University virologist March Fuchs, University of California Cooperative Extension Viticulture Advisor Rhonda Smith, and University of California Davis Foundation Plant Services director Deborah Golino can be seen online with current updates on Grapevine Red Blotch associated Virus (GRBaV), its effects on vineyards, and its status in planting material. http://grapesandwine.cals.cornell.edu/cals/grapesandwine/outreach/viticulture/ncpn-red-blotch.cfm
Finally, the 2013 Wine and Wine Grape Research Conference was held on February 21 at UC Davis. This event showcased current viticulture adn wine-related projects including a talks about Red blotch. The event’s presentations can be viewed at this link below.