College of Agricultural, Human, and Natural Resource Sciences

Organic Vineyard, Research Winemaker, VEEN

WSU’s First Certified-Organic Wine Grape Vineyard Harvests First Study on Weed Control

The 2.5-acre certified organic vineyard at WSU's research cetner in Mount Vernon.
The 2.5-acre certified organic vineyard at WSU's research center in Mount Vernon. Photo by Brian Clark/WSU.

As vineyard acreage in western Washington continues to increase, more farmers seek strategies for controlling weeds, especially in new vineyards. Heightened interest in organic wine grape growing on the west side also has growers looking for certified-organic weed control methods. Researchers Carol Miles and Tim Miller and graduate student Callie Bolton from WSU’s Northwestern Washington Research and Extension Center in Mount Vernon completed a two-year trial of sustainable weed control management on WSU’s first certified-organic vineyard.

The 2.5-acre vineyard was planted in 2009 in order to conduct research in organic wine grape production and disease management for local growers considering an organic operation. But weed control eclipsed other concerns, according to WSU Extension vegetable specialist Miles.

“Weed management in new wine grape vineyards was identified by local growers and winemakers as the primary constraint to establishing organic production in the region,” Miles said.

WSU Extension specialist Carol Miles checks a vineyard plot map.
WSU Extension specialist Carol Miles checks a vineyard plot map. Photo by Brian Clark/WSU.

Two early ripening wine grape varieties, Pinot Noir Precoce and Madeleine Angevine, grow at the Mount Vernon vineyard. There, Miles, Miller, and Bolton studied several weed-control treatments recommended by local growers and winemakers: rototilling and mowing; in-row cultivating with a Wonder Weeder, a new vineyard cultivator produced in Burbank, Washington; and planting in-row and between-row cover crops of winter wheat and winter peas, and a combination of the two.

Preliminary results showed that the cover crops were perhaps too effective because they not only competed against the weeds, but also with the young grape plants, Miles said. “All cover crop treatments tended to reduce shoot growth (new vine length), vine pruning weights, and change in vine diameter of both grape cultivars.”

When a vineyard is being established in the first three years, this competition is undesirable. Later, however, it’s important for maintaining a healthy balance between fruit load and vine growth, said Miller, a WSU Extension weed scientist. Grape vines tend to grow too thickly—at the expense of the grape clusters. “De-vigoring,” or slowing down excessive vine growth, helps keep that balance.

“In western Washington vineyards, cover cropping might be an excellent tool to use for weed management once vines start to produce fruit,” Miller said, “but probably not early in the life of a vineyard, when one wants fast establishment and lots of vine growth.”

Miles added that while it is likely best not to have in-row cover crops for a newly established vineyard, a comparison with cover crops planted only between rows was not included in their study. “So we cannot say that cover crops overall should be avoided during the establishment years.”

Rototilling and mowing between rows and hand weeding within rows were still the best weed control strategies for the vineyard, according to Miles and Miller. The Wonder Weeder provided good in-row weed management, but it may also cause significant damage to first-year vines, whose thinner trunks can’t withstand the cultivator’s tripping mechanism. Miller noted that the Wonder Weeder would probably work better when the vineyard’s plants are mature, with   thicker trunks and well established root systems.

Others participating on the weed management study were research associate Jonathan Roozen and technical assistant Jacqueline King, both from WSU Mount Vernon NWREC; and Mercy Olmstead, assistant professor of ag-horticultural sciences at the University of Florida in Gainesville.

Starting this year, Miles and her colleagues are fielding two more studies on organic wine grapes. The first, being conducted at a commercial vineyard, will evaluate the cost effectiveness of four newer organic fungicides for control of grape powdery mildew. The second will explore whether replanting or retraining is a better recovery method in a severely injured young vineyard after freezing, an apt trial considering that the Mount Vernon vineyard lost 30 percent of its plants due to freezing last November.

– Nella Letizia

Learn more about WSU’s West Side research and extension by visiting

Scientist Discovers New Horizons… Just across the Parking Lot

Climb a tall mountain, hike a long trail, move to a different part of the world–these are a few of the ways people commonly make major changes in their lives. Not Richard Larsen. He walked across the parking lot.

Richard Larsen at the lab bench pipetting grape juice in preparation for analysis.
Richard Larsen at the lab bench pipetting grape juice in preparation for analysis. Photo by Brian Clark/WSU.

Larsen is the recently hired research winemaker at Washington State University’s Irrigated Agriculture Research and Extension Center in Prosser. After 21 years a virologist with the U.S. Department of Agriculture, based on the Prosser campus across from the WSU facilities, Larsen crossed the parking lot to work for WSU. For the USDA, he studied viral pathogens of important legume food crops, including beans, peas and chick peas, and lentils, as well as studying soil-borne pathogens of alfalfa.

“But I’ve always been fascinated by wine,” Larsen said. When he was a kid in Portland, Oregon, he and his sister would investigate the morning-after remains of dance parties hosted by his parents in the family’s basement. “We went down searching for goodies—chips and such. There were glasses with the dregs of wine, too. In those days, it must have been rosé. In any case, it was disgusting!”

Later, the future scientist attended college at San Jose State University in the San Francisco Bay Area. “I majored in music performance,” Larsen said. Another turn in the research winemaker’s journey: he was a clarinetist and vocalist before turning to what would be his bread and butter, plant pathology.

In San Jose, though, and later at Cal Poly San Louis Obispo, where he earned a master’s degree in agriculture specializing in plant pathology, Larsen discovered California wine. Starting sometime in the late 1960s and developing over the course of the ’70s, Americans discovered they had a taste for premium European-style wines. Sweet, fruity pop wines gave way to big Cabernets and oaky Chardonnays.

Soon after Larsen took the virology position with USDA in Prosser, he met Sara Spayd, who served as WSU’s enology Extension educator for 26 years before returning to her native North Carolina. (In fact, they likely crossed paths, Larsen recollects, when they were both at the University of Arkansas in Fayetteville, where Larsen was earning his Ph.D. in plant science.) “Sarah had sensory experiments going, so she needed trained volunteers for tastings.” Enologists, like other food scientists, train volunteers in order to get a group of tasters whose palates are educated enough to detect small differences in taste in otherwise similar samples.

Through that volunteer training, Larsen discovered that he had a rare gift: he could detect not just small but truly minute differences in wines that most of us would say were from the same bottle. “That really got me going, so I started reading enology research papers.”

When Spayd returned to North Carolina, WSU’s current enologist, Jim Harbertson, joined the wine science team. “We hit it off right away. Jim has an amazing palette, so there is the enological friendship. And then there’s Manchester United… We’re like a couple of kids with baseball cards when it comes to soccer,” Larsen said.

A few of the fermentation tanks at WSU's research winery.
A few of the fermentation tanks at WSU's research winery. Photo by Brian Clark/WSU.

Harbertson and his colleagues designed a 5,000-gallon research winery – the largest in the Pacific Northwest. The project was ambitious, but necessary: in order to serve the burgeoning wine industry, grapes needed to be grown and wine needed to be made under conditions mimicking those encountered by commercial growers and vintners. Even if on a smaller scale, though, the winery is too much to handle for the small group of wine scientists in Prosser. A winemaker was needed to manage the multitude of experiments the team wanted to conduct.

“My plant pathology background was a big help,” Larsen said. “I already knew the importance of sanitation and understood how important the control of variables is in the scientific method.” It’s control of variables that make Larsen’s job even more complicated than a commercial winemaker’s. “There are lots of little iterations in what we do. Instead of a big vat of one thing, we have 10 vats, each one with just one different variable.”

Among the issues being addressed by WSU’s wine scientists are questions of fruit maturity. In a region with a short growing season, knowing with scientific precision what difference the maturity of grapes has on the final product is critical. Likewise, pinpointing the effects of different pH regimes on a wine’s phenolics (its color, aroma and flavor components) is important, as acidity influences the taste of wine. These are just two of the projects the team is working on that have ramifications for wine quality. Others include plant pathologist Naidu Rayapati’s project on Grapevine leafroll virus and its effect on fruit, and a project with viticulturist Markus Keller, who is investigating a variety of water management issues.

“There are some incredible levels of expertise on this team,” Larsen said. “Certainly some of the best in the country – if not the world.” Larsen said he loves coming to work. “I’ve read all those winemaking research papers over the years, but there’s nothing like working side by side with these people and learning by osmosis. It’s stimulating to the mind.”

Larsen’s palate is in big demand, not just at the Prosser campus. Larsen joins Thomas Henick-Kling, director of WSU’s program in viticulture and enology, in offering sensory seminars teaching professionals how to detect faults in the wines they are making, hopefully in time to make corrections. Larsen also sometimes serves as a judge at wine competitions. “When you’re tasting 20 or 30 big Cabs, your palate just gets worn out.” Larsen suggested a bite of roast beef to cleanse the mouth of tannins, or even a swig of beer, which has the same effect.

When asked how an aspiring winemaker might develop such a keen palate, Larsen said, “Drink lots of wine! Seriously, swirl, sniff and sip with others who really enjoy wine–and talk about what you’re tasting.”

– Brian Clark

Time for a career change? Check out WSU’s professional certificate programs in grape growing and winemaking at or our Bachelor of Science programs in viticulture and enology:

Learn more about WSU’s research winery in Voice of the Vine:

An article featuring Sara Spayd ran in Voice of the Vine here:

Hello, Old Friend, Where Have You VEEN?

WSU Extension viticulturist Michelle Moyer and her colleagues have just published a new issue of VEEN: The Viticulture and Enology Extension Newsletter. Among many useful articles in this issue is one by Moyer with the melancholy title, “Where was Summer?” It has gone the way of La Niña. As Moyer observes, though, “If grape production were easy, we wouldn’t define wine by the vintage.” True enough; and if it were easy, we wouldn’t need science-based solutions for the issues faced by growers and winemakers. In any case, 2011 is looking to be a great vintage, even if the harvest is a bit on the small side.

Budding palates: setting up for a wine sensory experiment.
Budding palates: setting up for a wine sensory experiment. Photo courtesy WSU.

This issue of VEEN has updates on measuring Brix, the WSU V&E certificate program, wine sensory science and much more. Grab your copy (it’s free!) here:

And while you’re at it, grab a couple of other free publications by Moyer and her colleagues from the WSU Extension publications web site (where most publications are available as free downloads). Moyer pointed out two new ones of special interest to Voice of the Vine readers.

The first is “Botrytis Bunch Rot in Commercial Grape Production,” which is sure to be a reluctant hit in the wake of such a damp summer. Point your browser to and click the “download PDF” link to get your copy.

The other new pub is likewise pertinent: “Assessing and Managing Cold Damage in Washington Vineyards.” Learn how to determine if cold temperatures have damaged your vines, as well as ways to avoid such problems. You’ll find that guide here:

-Brian Clark

Visit WSU V&E Extension on Facebook — and give ’em a big thumbs up:

Leave a Reply

Neither your email address nor comment will be published. Required fields are marked *

CAHNRS is more than agriculture. With 24 majors, 19 minors, and 27 graduate level programs, we are one of the largest, most diverse colleges at WSU. CAHNRS Cougs are making a difference in the wellbeing of individuals, families, and communities, improving ecological and economic systems, and advancing agricultural sciences.



CAHNRS students are awarded more than $600,000 in scholarships annually.


CAHNRS has 39 student clubs and organizations to enhance student experiences and opportunities.


With 24 majors, 19 minors, and 27 graduate level programs, CAHNRS is one of the largest, most diverse colleges at WSU.


CAHNRS leads in discovery through its high-quality research programs. In 2014, CAHNRS received research funding exceeding $81.5M. This accounts for nearly 40% of all research funding received by WSU.  


Fall undergradsUndergraduate Studies

Check out every department and program CAHNRS has to offer, from Interior Design to Agriculture to Wildlife Ecology. We have 13 departments and schools to prepare you for your chosen career.

Grad student dogGraduate Studies

Students have a variety of options to pursue masters and doctoral degrees. Many of these have very specific background requirements, so we suggest exploring the individual programs for academic guidelines.

CTLLCenter for
Learning & Leadership

The CTLL is a student, faculty, alumni and industry partner collaboration for high quality learning and leadership beyond the classroom.


Inspiring Teamwork - Arron Carter pic

Inspiring Teamwork – Arron Carter

It started with a car, a ’69 Corvette Stingray to be exact.

When Arron Carter, the director of the Washington State University Winter Wheat Breeding Program, was in high school his agricultural teacher had a ’69 Corvette Stingray. Every year this teacher would let his favorite senior take the car to senior prom. Carter had never taken an agriculture class before, but he knew he wanted to drive that car.

“Well, if I’m going to be the favorite senior,” Carter said to himself, “I’d better start taking some ag classes.”…

Read More: Inspiring Teamwork – Arron Carter


CAHNRS Office of Research

Agricultural Research Center

Mission Statement

The goal of the Washington State University CAHNRS Office of Research is to promote research beneficial to the citizens of Washington. The Office of Research recognizes its unique land-grant research mission to the people of Washington and their increasing global connections. The CAHNRS Office of Research provides leadership in discovering and applying knowledge through high-quality research that contributes to a safe and abundant food, fiber, and energy supply while enhancing the sustainability of agricultural and natural resource systems.

Featured Research

sliced pear

Research for specialty crops boosted by $1.7 million

More than $1.7 million was awarded to Washington State University for specialty crop research including berries, potatoes, grapes, tree fruit, onions, carrots and Christmas trees.
Western bluebird with cricket. Photo by flickr user Kevin Cole.

Weighing the benefits, risks of wild birds on organic farms

Washington State University researchers will help organic growers protect human health by assessing the risks and benefits of wild birds on organic farms. Researchers received nearly $2 million from the USDA Organic Research and Extension Initiative to conduct the study.
Moyer Testimony 9.29.15

VIDEO: Jim Moyer testifies on specialty crop research before House Agriculture Committee

Jim Moyer, associate dean of research for CAHNRS and director of the Agricultural Research Center at WSU, presented specialty crop research innovations in Washington, D.C. this fall.
Winter Wheat May 2014 by McFarland

‘A quiet crisis’: The rise of acidic soil in Washington

Gary Wegner first noticed the problem in 1991, when a field on his family’s farm west of Spokane produced one-fourth the usual amount of wheat. Lab tests revealed a surprising result: the soil had become acidic.

Study: Small railroads important but costly to upgrade

More than half of Washington’s short-line rail miles aren’t up to modern standards, according to a recent study by the Washington State Department of Transportation and the Washington State University Freight Policy Transportation Institute.
A grizzly bear with her cubs at the WSU bear center.

Single hair shows researchers what a bear has been eating

By looking at a single hair, U.S. and Canadian researchers can get a good idea of a grizzly bear’s diet over several months.

CAHNRS Office of Research

Hulbert Hall 403
PO Box 646240
Pullman, WA 99164-6240
PH: 509-335-4563
FAX: 509-335-6751

Alumni & Friends

Holiday Hours & End-Of-Year Giving

It’s that time of year again—time for sharing merry moments with family and friends. As you prepare for the holidays, consider these year-end giving tips below. We know how important the last few days of 2015 will be for meeting tax deadlines, and we are here to help make the process as easy as possible.

Please note the WSU Foundation’s hours of operation through the end of the year:

Dec. 2 – Dec. 23: Normal operation (8:00 a.m. to 5:00 p.m.)

Dec. 28 – 31: Although Washington State University and the WSU Foundation will be closed, WSU Foundation gift accounting and gift planning staff will be available by phone from 8:00 a.m. to 5:00 p.m. throughout this week. If you would like to give a gift of appreciated stock or discuss your year-end giving plans to benefit WSU, please call 1-800-448-2978.

Making a gift online using the WSU Foundation’s secure site is an easy way to make your year-end gift using a credit or debit card any time, day or night. Note: Online gifts may be made as late as 11:59 p.m. on Dec. 31 to receive tax credit for 2015.

Thank you for your generous support of Washington State University throughout the year. Have a wonderful holiday season!

Year-end Giving Tips:

Remember, only gifts made by Dec. 31 can help reduce your 2015 taxable income. Please keep the following in mind and consult your tax advisor for specific details.

To Receive 2015 Tax Credit:

  • Make sure your gift is dated and postmarked no later than Dec. 31, 2015.
  • Complete your online gift on or before 11:59 p.m. (PST) on Dec. 31, 2015. We accept Visa, MasterCard, and American Express.


The date you deliver or mail your donation is generally recognized as the gift date for tax purposes. Please note, the date on the actual check or money order is not recognized by the IRS as proof of your intent to give on a particular date. Gifts by check or money order may be mailed to:

WSU Foundation
PO Box 641927
Pullman, WA 99164-1927

Note: Gifts may be hand-delivered to the WSU Foundation Town Centre Suite 201 during hours of operation.

Credit Cards:

The date your account is debited is considered the date of the donation. In order to receive a 2015 charitable income tax deduction, credit card gifts must be processed against your account in 2015. Please make sure to make your gift online using your Visa, MasterCard, or American Express.

Have your stocks gone up in value this year? Consider making a simple and tax-wise gift of appreciated stock. Please note that mutual fund shares may take several weeks to transfer, and the gift is not considered complete until the shares are received in the WSU Foundation’s account. To give the University stock or discuss your year-end gift to WSU, please call 1-800-448-2978.

Contact Us

CAHNRS Alumni & Development
PO Box 646228
Pullman, WA 99164-6228
PH: 509-335-2243

Faculty & Staff

Important Dates and Deadlines


A-Z Index of Faculty and Staff Resources:

  • Click letters to sort alphabetically
  • Click individual items to view or download

Contact Dean’s Office:
Hulbert 421
PO Box 646242
Pullman WA 99164-6242

Lisa Johnson:
Assistant to the Dean
Hulbert 421C
PO Box 646242
Pullman WA 99164-6242

How many varieties of wheat has WSU developed?



Sentence or two with more info about the subject.