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Final Report June 2023 Principal Investigator: James Harbertson, Washington State University, Richland Telephone: 509-372-7506 Cooperators: Tom Collins, Washington State University, Richland; Markus Keller, Washington State University, Prosser Summary: This research sought to investigate claims by wineries that Cabernet Sauvignon wines made from fruit that was picked after an early frost…
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Published in Wines & Vines By Yun Zhang and Melissa Hansen March 2018 Essential in arid and semiarid grapegrowing regions, irrigation is a management tool used to manipulate yield and enhance the quality of wine grapes.4 However, longstanding myths of the wine industry still have strong influence on irrigation practices—to…
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Final Report: June 2023 Principal Investigator: Jim Harbertson, Washington State University, Richland Telephone: 509-372-7506 Cooperators: Katie Nelson, Chateau Ste. Michelle Wine Estates Summary: Wine acidity has been identified as one of the principal chemical and sensory wine attributes to be impacted by climate change. Understanding how to alter our wines…
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Published in Good Fruit GrowerBy Ross Courtney May 19, 2020 Washington State University virologist Naidu Rayapati has been screening vineyard samples for viruses in his laboratory for about 15 years. He wants growers to keep those samples coming. As grapevine red blotch and grapevine leafroll become more prevalent, as…
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Published in Good Fruit GrowerBy Ross Courtney May 22, 2019 No matter the chore, no matter the state, whether large or small. It nearly always pays off to mechanize vineyards these days. That’s the conclusion from Clark Seavert, an Oregon State University agricultural economist, who recently crunched the numbers…
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Final Report: 2020-2021 Funding Cycle Principal Investigator: Doug Walsh, Professor of EntomologyWashington State University Irrigated Agriculture Research and Extension Center24106 N. Bunn Rd, Prosser, WA 99350dwalsh@wsu.eduTel. 509.786.9287 Summary: Objective 1. Determine how increasing concentrations of imidacloprid in leaf tissues impacts Tetranychus urticae and Eotetranychus willamettei behaviors (lifespan and fecundity). We…
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Published in Practical Winery & VineyardBy Melissa Hansen & Joelle Martinez October 2020 Winegrape water management has witnessed many breakthroughs during the last two decades, from deficit irrigation optimization to vine and berry water relation studies. Most recently, scientists have looked to optimize irrigation management for red and white varieties.
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Final Report: 2017-2021 Funding Cycle Principal Investigator: Markus KellerWashington State University, Irrigated Agriculture Research and Extension Center24106 N. Bunn Rd., Prosser, WA 99350, (509) 786 9263, mkeller@wsu.eduCooperator: James Harbertson, WSU Wine Science Center, Richland WA 99352 Vineyard management for optimum wine quality and low labor input is a top industry…
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Published in Good Fruit GrowerBy Melissa Hansen, Washington State Wine Commission February 1, 2020 Research is a bright spot in the Washington wine industry. The Washington State Wine Commission commits roughly 25 percent of its budget to viticulture and enology research. The program is driven and guided by the industry,…
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Final Report: June 30, 2021 Principal Investigator: Tim DonahueOrganization: Walla Walla CollegeEmail: winemakertim@gmail.com Summary: Flotation is a technique of using compressed gas combined with fining agents (bentonite, gelatin) to clarify white wine juice. The predominant reason for using flotation is to clarify juice quickly (2-3 hours vs. 1-2 days) and…
