Issue link: http://read.dmtmag.com/i/54939
Diseases & Disorders begin after veraison and continue through harvest where they are more pro- nounced. "By harvest, there can be a 10 percent difference in Brix," Rayapati said. "It's not something that happens right at harvest, but leafroll disease affects fruit quality in Merlot throughout berry development." Wine quality impacts Rayapati kept the Merlot leafroll-infected grapes separate from the normal fruit during harvest and crush, with wines made in 2010 and 2011 in small research quantities by Dr. Jim Harbertson, WSU's extension enologist. Harbertson observed that wines from the diseased vines were lighter in color than the normal wines. Also, the infected wines were lower in anthocyanins by an average of 13 percent, and in tannins by about 25 percent. Additionally, phenolics averaged nearly 15 percent less in the leafroll wines, and the polymeric pigments were about 15 percent lower than in the normal Merlot wines. While Rayapati found little difference in the pH and titratable acid- ity in the finished wines, there was significantly less alcohol ethanol (13 percent less) in the leafroll wines. The impact from diseased fruit on the sensory analysis of the wines was also apparent, he said. The leafroll wines were browner in color, had an earthier and less red fruit aroma and flavor, and the mouth feel, evaluated by astringency, was inferior to that of the normal wine from the same vineyard. "In general, leafroll-affected vines produced wines that were more acidic with less fruit qualities," Rayapati said. "Healthy vines had a nicer mouth feel." Rayapati's research was supported by the Washington Wine Advisory Com- mittee and the U.S. Department of Agriculture's Specialty Crop Research Initia- tive. The Washington Wine Industry Foundation recently received a specialty crop block grant of $250,000 from the Washington State Department of Agricul- ture to fund a clean plant project designed to halt the spread of grape viruses and diseases. A statewide clean plant campaign is planned in partnership with WSDA and Rayapati to help the industry control, prevent, and manage viral diseases. Rayapati presented his findings during the annual meeting of the Washington State Grape Society. • Prevent Replant Disease and Nematode Infestation ROOTSTOCK – VARIETIES – POLLINATION Quality from the Start APPLES Aztec Fuji® (DT2 variety) Blondee® Brookfield® Gala Buckeye® Gala Cameo® brand Granny Smith Honeycrisp It® Red Delicious POLLENIZERS Indian Summer Manchurian CHERRIES Attika® Benton™ Bing Joburn Braeburn™ JonaStar® Jonagold Kumeu Crimson® LindaMac® Mariri Red™ Braeburn Morning Mist™ Early Fuji Morren's® Jonagored Supra™ Mt. Blanc Mt. Evereste EbonyPearl™ BlackPearl™ Kootenay™ BurgundyPearl™ Lapins Chelan™ PEARS Bartlett Pearleaf Snowdrift Early Robin® Rainier RadiancePearl™ Hudson Regina Sam Montmorency D'Anjou Columbia Red Anjou™ Forelle Concorde™ Comice PEACHES Allstar Autumnstar® Blazingstar Golden Russet Bosc® Selah™ Red Clapp's Favorite Red Sensation Bartlett Seckel Pinedale Ruby™ Rainier Skeena™ Sweetheart Tieton® Van White Gold Redcort® Ruby Jon® Ruby Mac™ Smoothee® Golden Spartan Ultima™ Gala Zestar!® Coral Star Redstar Earlystar™ Elberta Blushingstar Glowingstar Brightstar™ Redhaven Risingstar Starfire Flamin' Fury® Series PF-19-007 PF-7 PF-24-007 PF-17 PF-35-007 PF-25 PF Lucky 13 Varieties listed may not reflect current inventory. REPRESENTATIVES with Telone* C-17 soil fungicide and nematicide (includes chloropicrin) CUSTOM ORCHARD FUMIGATION Chris Ford/Dale England/Len England 509 687-9572 Chris, cell/text: 509 366-5180 Dale, cell/text: 509-860-9058 Len, cell: 509-679-7124 E-mail: customorchardfumigation@live.com P.O. Box 11, Burbank, WA 99323 Visit us at customorchardfumigation.com www.goodfruit.com *TRADEMARK OF DOW AGROSCIENCES LLC Leonard Aubert Jim Adams Hood River, Oregon Washington State (541) 308-6008 aubert@gorge.net (509) 670-7879 Larry Traubel Rick Turton Cedaredge, Colorado Kelowna, B.C. (970) 856-3424 (250) 860-3805 ltraubel@hotmail.com Rey Allred Payson, Utah (801) 465-2321 jimadams@willowdrive.com Larry Lutz Nova Scotia (902) 680-5027 Larry.Lutz@scotiangold.com WILLOW DRIVE NURSERY, INC. 1-888-54-TREES Ephrata, Washington | www.willowdrive.com GOOD FRUIT GROWER FEBRUARY 15, 2012 33 Schedule your application OD application TODAY!