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26 WINES&VINES January 2017 T h e R e v o l u t i o n a r i e s B e h i n d Wi n e's Vi s i o n a r i e s For over 90 years, Gusmer has oered a full range of innovative enological tools that enable your creative expression through unique and interesting wines. Equipment, analytical instruments and processing aids brought to you from leading suppliers in the wine industry, all backed by strong Gusmer technical support. The options for expression have never been greater and the tools have never been better – so go ahead, be unique, express yourself. For more information, contact Gusmer today. West Coast : 81 M Street Fresno, CA 93721 Tel: 559.485.2692 Midwest : 1401 Ware Street Waupaca, WI 54981 Tel: 715.258.5525 The Wine Lab TM : 640-D Airpark Road Napa, CA 94558 Tel: 707.224.7903 East Coast : 1165 Globe Avenue Mountainside, NJ 07092 Tel: 908.301.1811 Gusmer Sonoma Store : 9025 Old Redwood Hwy, Ste E Windor, CA 95492 Tel: 707.836.1056 NOW OPEN YEAR-ROUND www.gusmerwine.com sales@gusmerenterprises.com Divergan F – PVPP Malolactic Bacteria, Non-Saccharomyces Yeasts Fermentation Nutrients Membrane Cartridge Filters, Laboratory Consumables OenoFoss - FTIR Analytical Instrumentation Filter Sheets, Lenticular Cartridges, Cellulose Pre-Coat Fibers Cross Flow Filters, RO Systems Liquid and Granular Enological Enzymes Oak-Mor®/ Oak Avantage® Chips and Granular Oak CO 2 Analytical Instrumentation H2S Preventing Saccharomyces Yeasts Lysozyme French Oak At Gusmer, we know the wine you create is just as as you are. unique D avis, Calif.—Grapevine Pinot Gris virus (GPGV) has been detected in vineyards in 14 locations in Napa County, but not in other California vineyard lo- cations to date, based on initial find- ings from a statewide survey started in 2016 and funded through an American Vineyard Foundation re- search grant. These findings and an update on GPGV were presented by Dr. Maher Al Rwahnih, diagnostic and research lab director at Foundation Plant Services (FPS) at the Univer- sity of California, Davis, during a day-long extension class, "Current Issues in Vineyard Health," held Nov. 29 in Davis. Disease symptoms associated with GPGV were first observed in vineyards in Italy's Trentino Alto Adige region in 2003. Symptoms include chlorotic leaf mottling, leaf stunting and deformation, delayed vine growth, stunted canes and reductions in yields. There have been reported impacts on grape quality and plant growth in European vineyards as well. GPGV has been reported in red and white wine and table grape varieties in a growing list of coun- tries including Canada and the United States. In 2015, Davis-based commer- cial testing lab Agri-Analysis re- ported that seven vines from four separate vineyards tested positive for GPGV in Napa Valley. This is believed to be the first reported de- tection of GPGV in commercial vineyards in the United States. To date, infected vines have only been found in Napa County. The AVF survey detected GPGV in sam- ples of Cabernet Sauvignon, Char- donnay, Sauvignon Blanc, Malbec, Merlot, Petit Verdot, Pinot Noir, Zinfandel, Viognier, Sauvignon Musque and the rootstock 1616C. In one newly planted Napa vine- yard, 100% of the vine samples tested were infected with GPGV. Al Rwahnih said this vineyard was planted with rootstock in 2014 and field budded in 2015. This strongly suggests that the vine material al- ready had the virus when it was placed in the field. Since much is still unknown about this virus, its detection does not necessarily mean the disease will affect vine health. In many cases, GPGV is found in vines with multiple virus infections. Another finding from the 2016 survey was that the virus level (titer) in infected vines was high- est in the early season (May and June) and decreased during the growing season. Based on recent research in Italy, the grape erineum mite, a type of eriophyid mite found in vineyards worldwide, was shown to be a vector that can transmit GPGV to healthy grapevines in greenhouse experiments. —Ted Rieger Pinot Gris Virus Discovered in More Napa Vineyards This Napa Valley grapevine displays chlorotic leaf mottling. It tested positive for a mixed infection of grapevine Pinot Gris virus and grapevine fanleaf virus. WINE INDUSTRY NEWS