Posts Tagged: winegrapes

Mechanical winegrape management produces superior grapes

UC Cooperative Extension specialist Kaan Kurtural is managing a vineyard at the 40-acre UC Oakville Field Station in Napa County with virtually no manual labor, reported Tim Hearden in Capital Press. 

“We set this up to be a no-touch vineyard,” Kurtural said. “All the cultural practices are done by machine.”

Kurtural's original intent was to help farmers deal with labor shortages, but the trial also produced superior winegrapes.

“When I took the job at the University of California, the labor situation started to get worse,” Kurtural said. “If we didn't have people to prune grapes, we weren't able to finish pruning. So we said, ‘We are a research station, let's develop a solution.'”

In the research vinyard:

• A machine equipped with telemetry and GPS sensors prunes the vines
• Soil and canopy data are collected manually
• Spurs and suckers are thinned with a specially designed pruner
• Clusters are thinned mechanically
• The grapes are harvested mechanically

“We can do all the practices mechanically now,” he said. “There was no economic need to do this previously, but now there is.”

Kurtural attributes the winegrape quality improvements to the tall canopy, which protects grapes from sun damage. The system also uses less water.

For complete details, watch a 40-minute lecture by Kaan Kutural online

Dry-land farming of winegrapes has a place in Napa and Sonoma

Grapes farmed in Northern California's famed "Wine Country" can be successfully produced with no irrigation water applied at all, reported Ellen Knickmeyer of the Associated Press.

She spoke to farmer Frank Leeds, who produces grapes in Napa Valley without adding water, not because of the drought, but because he believes the practice produces the best wine. Another option some farmers are using is deficit irrigation, which provides irrigation water at carefully timed intervals.

The farmers believe dryland farming and deficit irrigation force the vines to develop deeper roots that give wine distinctive "terroir" notes, flavor character it derives from the environment. But they must be cautious to avoid the dreaded "r" word - raisin, said a UC Agriculture and Natural Resources (UC ANR) expert.

"I do know that (various) wineries have a preference, but the overarching preference is that the fruit is sound and it arrives at the winery not shriveled up as a raisin," said UC ANR Cooperative Extension advisor Rhonda Smith.

Extension conference to help practitioners reach winegrape farmers

A support network for California winegrape growers will gather in Lodi March 24-26 at the National Viticulture and Enology Extension Leadership Conference. UC Agriculture and Natural Resources plays a vital role in developing and extending research-based information to the California winegrape industry. UC ANR advisors and specialists work directly with farmers and with industry professionals who also help ensure that the latest knowledge on grapevine pest control, nutrition, pruning, irrigation and other practices make their way into the hands of the people growing grapes in the field.

The conference begins on March 24 with presentations on new research. On March 25, participants take a tour of Lodi-area vineyards and wineries. The “Innovations in Extension Symposium” will be March 26. (Full agenda.)

“At the symposium, we'll be focusing on extension strategy,” said Matthew Hoffman of the Lodi Winegrape Commission, the sponsoring organization.

The events involve nearly a dozen UC ANR academics, including three Cooperative Extension viticulture advisors who were hired during the past year: Lindsay Jordan of Madera, Merced and Mariposa counties, George Zhuang of Fresno County and Ashraf El-Kereamy of Kern County.

During the session on innovations in extension, UC ANR's Franz Niederholzer, an orchard systems advisor in Sutter and Yuba counties, will discuss an extension project underway in collaboration with scientists in Washington and Oregon. The project, funded by the USDA, will offer training in spray application technology to the farming community.

“Spray application technology is very important to integrated pest management and to farming in general,” Niederholzer said. “Mischief can happen if you don't spray properly. Growers have so many things to consider, we want to revisit the fundamentals of spraying with them.”

UC ANR specialist Mark Lubell will discuss the use of social networks in agricultural extension. Social networks and social media can help improve access to information, transmit knowledge efficiently and deliver information when and where it is needed. Lubell will share tools that can be used to conduct networked outreach and build extension efforts.

Other UC ANR presenters are Chris Greer, vice provost of Cooperative Extension, Matthew Fidelibus, viticulture specialist based at the UC Kearney Agricultural Research and Extension Center, Ryan Murphy of the Agricultural Sustainability Institute, and Neil McRoberts, plant pathology professor at UC Davis.

For more information about National Viticulture and Enology Extension Leadership Conference, contact Matthew Hoffman at (209) 367-4727, matthew@lodiwine.com.

An initiative to enhance competitive and sustainable food systems is part of UC Agriculture and Natural Resources Strategic Vision 2025.

Winegrape growers concerned about drought

Winegrape growers who rely on groundwater are worried about the dismal rainy season so far, reported Ed Joyce on Capital Public Radio. He quoted the National Oceanic and Atmospheric Administration as saying that, barring "epic rain and snowfall," the drought will likely continue through the spring and summer.

Joyce spoke to a a dismayed winemaker, a worried vineyard manager and he gathered background for his four-minute story by interviewing Lynn Wunderlich, UC Cooperative Extension farm advisor for El Dorado, Amador, Calaveras and Tuolumne counties.

"There's a lot of concern out there amongst growers that I work with in the four counties in the Central Sierra," Wunderlich said. "Generally in the foothills we have a shorter depth in the soil from the surface to the bedrock, so that all impacts the available water that a grower has."

Because of the drought, Wunderlich said some growers are extending their wells or digging new wells to increase groundwater supply.

"I even had an email from a small grape grower who said he's collected rainwater this season," Wunderlich said. "So people are getting quite creative in their attempts to conserve water, knowing that we're going to have potentially a tough season."

A Treasury bond nets greater return than vineyard

The Stockton Record yesterday ran a story about the dismal economics associated with growing grapes in the San Joaquin Valley, based on a study co-authored by UC Cooperative Extension viticulture advisor in San Joaquin County Paul Verdegaal.

The story, written by veteran ag reporter Reed Fujii, opened with a telling quote from local farmer Brad Goehring, who helped with the cost study.

"At best, we're looking at about a 4 percent return on investment," he was quoted. "You could sell your land, liquidate everything, put your money into a Treasury bill and earn essentially the same return."

The UC cost-of-production study, based on a hypothetical vineyard, estimates that year-to-year operating profits of less than $1,000 an acre get eaten up by overhead costs, such as taxes, insurance and management expenses. The value of land, initial vineyard planting costs, farm buildings and equipment runs the accounting deep into the red, losing more than $2,000 an acre, the Record's story reported.

The sad conclusion was given in a quote from Verdegaal:

"In a true economic sense ... grape growing, or probably most of agriculture, from what we've seen the last few years anyway, doesn't pay."

The story ended with one ray of hope. It says the long down cycle in winegrape prices may be on the upswing. Growers and others have recently reported spot market prices of $500 to $550 a ton for cabernet sauvignon and $600 for chardonnay, Fujii wrote. That's much higher than the $393 per ton average for last year.

The cost study, Sample Costs to Establish and Produce Winegrapes (Cabernet Sauvignon), San Joaquin Valley North, was one of 12 released this month by the UC Davis Department of Agriculture and Resource Economics. For more, see this news release on the cost studies.

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