Issue link: http://winesandvines.uberflip.com/i/957564
April 2018 WINES&VINES 87 WINE EAST GRAPEGROWING Overall, the percentage of vines testing positive for the viruses ranged from 12% to 34% for the vinifera blocks, and only 2.5% for Chambourcin. Early results show a range of infection: Some farms sampled showed no evidence of GLRaV-1 and 3, while other farms were heavily infected with them. This is just a quick snapshot of the results to date, and further analysis may change or modify this picture somewhat. As expected, many of the vines that tested positive for viruses displayed leaf symptoms of the disease. However, a few symptomatic vines turned up with negative test results for the GLRaV-1 and 3. It should be noted that these symptoms are not necessarily diagnostic of the presence of these two viruses, and symptoms may be due to other causes such as additional viruses or low virus titer. Again, only tissue analysis in the laboratory can con- firm the presence of GLRaVs. Interestingly, some asymptomatic vines tested positive for the presence of at least one of the two viruses. Results of this study will also be analyzed to test if a relationship exists between varieties, vine age and virus titer. Metadata collected from growers also will be used to tease apart the effect of rootstocks and scion, and to investigate the origin of the infected material. As Pennsylvania's wine grape industry continues to grow, the effects of grapevine leafroll viruses will probably become more evident in vineyards. What does this mean? First of all, the project should be continued. It's obvious that leafroll viruses can be found in vineyards from one end of the state to the other, and the impact on the Pennsylvania wine grape Natural Corks Champagne Corks Twinline Corks Bartops VISION Synthetic Corks G-Cap® Screw Caps Sales Representatives: Chris & Liz Stamp info@lakewoodcork.com lakewoodcork.com 4024 State Route 14 Watkins Glen, NY 14891 607-535-9252 607-535-6656 Fax PIONEER INNOVATOR PARTNER Adjacent vines, one with symptoms of grapevine leafroll virus and one with no sign of the disease. Gomberg, Fredrikson & Associates Market Research For e Wine Industry Products include: · The Gomberg-Fredrikson Report: "The Executive Marketing Report of the Wine Industry" · WineData Wine Pricing Report: Competitive supplier pricing for more than 13,400 products · Distributor Market Service: Gain a competitive advantage by analyzing your position in the wholesale market www.gfawine.com • 707.940.3922 • inquiry@gfawine.com We perform extensive market research and data collection to create the wine industry's leading databases and reports