UCCE Humboldt - Del Norte Counties
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UCCE Humboldt - Del Norte Counties

Posts Tagged: glassy-winged sharpshooter

Sonoma County grape growers face a triple threat

European grapevine moth, native of Italy, made its way to the U.S. in 2009, where it was first detected in Napa County vineyards.
European grapevine moth, light brown apple moth and glassy-winged sharpshooter combine to make "vigilance" the word of every day for growers in Sonoma County, reported Bonnie Durrance in the Sonoma County Sun.

“Invasive pests are a problem,” said Nick Frey, president of the Sonoma County Winegrape Commission. “They threaten California agriculture in general, and probably our ecology too, so it’s important to try to prevent their import into the state, and if they do get here, to detect them early. If you don’t get early detection, your odds of eradication are low.”

Rhonda Smith, UC Cooperative Extension advisor in Sonoma County, said local citizens also need to understand and comply with rules to prevent the introduction and spread of invasive species.

“The bottom line is, follow the rules,” Smith said, “because ultimately, the result is pretty dramatic. And who pays the price for that? We pay the price for the enormous effort to eradicate something once it’s here, and/or, we completely lose that industry. We then begin to eat more fruits and vegetables we don’t grow here in California.”

'Two-way learning' embraced
Tim Hearden, Capital Press

Rick Buchner, UC Cooperative Extension advisor in Tehama County, was featured as a "Western Innovator" in a Capital Press story published yesterday. In the article, he explained how the UCCE two-way learning model - involving UC academics and farmers - has been successful in solving agricultural problems.

"The beauty of extension is that we all learn together," Buchner said. "The growers know things that I don't, and I hopefully can share things from the university that they don't know. When we work together, it's a pretty powerful team."

Posted on Friday, October 5, 2012 at 10:58 AM

Colorado cantaloupe listeria outbreak affects California growers

A listeria outbreak in Colorado last fall resulted in 30 deaths and more than 146 illnesses.
The Colorado farm linked to a deadly listeria outbreak last fall is 1,300 miles away, but the tragedy changed a way of life in Mendota, Calif., the Central Valley farm town that proudly calls itself the Cantaloupe Center of the World, said an article in the Los Angeles Times by Diana Marcum.

This would normally be the season when farmers plan the summer crop that in good years is valued at nearly $200 million, according to the California Cantaloupe Advisory Board. Instead, they are cutting acreage and scrambling for ways to reassure a nervous public that cantaloupes are safe to eat.

This month the UC Center for Produce Safety will host a closed-door symposium in San Diego for cantaloupe growers, shippers, agricultural researchers, government regulators and others to create guidelines for best growing practices.

"The main question will be, 'What are the gaps in our knowledge?'" said Bonnie Fernandez-Fenaroli, executive director of the UC Davis-based center. "Do we need to do research or is it a matter of the cantaloupe industry implementing and enforcing best practices?"

UCCE director in Tulare County takes Kings County reins
Lewis Griswald, Fresno Bee News Blog

Tulare County UC Cooperative Extension Director Jim Sullins will also be director of the Kings County UCCE office. Longtime Kings County UCCE director and 4-H youth advisor Peggy Gregory retired at the end of the year. She served 37 years with the University, including 20 in Kings County.

Grape growers fend off thieves, pests
Fresno Business Journal

Pests and thieves can cost grape growers a great deal of money and headaches. That’s why the two issues were addressed along with other important topics at the UC Cooperative Extension San Joaquin Valley Grape Symposium held Wednesday in Easton.

UCCE viticulture farm advisor Stephen Vasquez gave an update on glassy-winged sharpshooters and Pierce's disease. He said that recent catches of sharpshooters are concerning since they have been found near a major riparian corridor that has had a historically low level of Pierce’s disease.

Posted on Friday, January 6, 2012 at 10:14 AM

ANR in the news during winter break

While many offices are closed between Christmas and New Year's Day, the media don't stop distributing news. Following is a sampling of recent news stories with an ANR connection.

In battle to save Bonny Doon vineyards, scientists try tricking bacteria
Beth Mole, Santa Cruz Sentinel

UC Berkeley plant pathologist Steve Lindow is studying the use transgenic grapevines to control Pierce's disease.
Scientists are now investigating less costly methods of managing glassy-winged sharpshooters and the spread of Pierce's disease. Steve Lindow, a plant pathologist from UC Berkeley, is using something similar to a Jedi mind trick: Convince the bacteria they've already caused disease.

But to stop these microscopic killers, scientists had to do some criminal profiling.

When Xylella get into a grape vine, they're released in the vascular tissue -- the plumbing of the plant that pumps water up from the roots. From there, the bacteria use the tissue as "hallways" to invade the whole vine. They then start exploring and munching on the plant.

"We think that the exploratory phase involves rather promiscuous movement of bacteria," Lindow said. But as they spread from place to place, there are only a few bacteria in each area, he said.

Each bacterium constantly sends out a molecular beacon that allows them to collect. Lindow and his team of researchers realized that this beacon is the bacteria's glaring weakness -- without it, they wouldn't make it into their next sharpshooter or kill the vine. So, the researchers engineered transgenic grapevines to make the same beacon.

Pesticide use rises throughout Merced County
Joshua Emerson Smith, Merced Sun-Star

Pesticide use in Merced County is on the rise, according to the annual report from the California Department of Pesticide Regulation. The bump followed a statewide trend that saw an increase in pesticide use after four years of decline.

The reporter talked to Paul Towers, a spokesperson for the Pesticide Action Network, who said, "California is stuck on a pesticide treadmill."

UC Cooperative Extension farm advisor Maxwell Norton said the idea that alternatives to pesticides aren't being pursued is false.

"Pest management has more resources dedicated to it than any other field of agriculture research," he said. "Agricultural researchers are putting a lot of resources into alternative systems. The research reports are there in the hundreds for people to read. We will eventually come up with alternatives."

Leaf curl dilemma
Debbie Arrington, The Sacramento Bee

Folks with backyard peach or nectarine trees face a major problem this winter. Used to control leaf curl, Micro-cop copper fungicide spray and lime sulfur no longer are available to California home gardeners due to environmental concerns. The fungicide sprays that are available have much lower concentrations of copper.

"It's a pretty big deal right now," said Chuck Ingels, Sacramento County UC Cooperative Extension's horticulture advisor. "Those products worked. We don't really have an alternative yet."

This month, Ingels and master gardeners are conducting tests on possible alternatives, such as Liqui-Cop and Concern copper soap, at the Fair Oaks Horticulture Center's orchard. Because the fungus needs water to multiply, they're also testing another approach: Covering whole trees with breathable fabric to prevent moisture from accumulating on the branches.

"Until we know what works, the best option is to plant varieties that are resistant to leaf curl," Ingels said.

Olive oil's secret: Not enough real virgins
Ronald Holden, Crosscut.com

In a report a year ago, UC Davis researchers found that 69 percent of imported "extra virgin" olive oil (and 10 percent of domestic oil) wasn't what it pretended to be. Even the best-known brands showed signs of adulteration —blended with inferior grades of olive oil or cheaper oils from soybeans, hazelnuts, and sunflower seeds.

The lone import to receive top ratings on all points was Costco's Organic Extra Virgin Oil, which sells for one-fifth the price of competing brands.

Posted on Tuesday, January 3, 2012 at 1:31 PM
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