Capitol Corridor
Capitol Corridor
Capitol Corridor
University of California
Capitol Corridor

Posts Tagged: Daniel Sumner

Monthly news round up: January 2018

Woodland as ag hub topic of forum

(Woodland Daily Democrat) Jenice Tupolo, Jan. 30

Developing Woodland as an agricultural center is becoming more of a reality, even as local organizations worked together in creating a forum focused on agricultural innovation in Yolo County.

...The city of Woodland, AgStart, UC Agricultural and Natural Resources, and the city's Food Front initiative hosted keynote speaker and vice president of the UC ANR, Glenda Humiston, at the conference.

http://www.dailydemocrat.com/business/20180130/woodland-as-ag-hub-topic-of-forum

Small Farmers in Fresno Hope for Big Moringa Payoff

(KQED) Katrina Schwartz, Jan. 26

The Mouas, along with other Hmong farmers growing moringa, have been working with farm advisers at Fresno County's UC Cooperative Extension to learn how to dry, powder and store their moringa so they can expand into new markets. Most farmers sell it fresh, but most of the health food craze exists around moringa powder, often imported from India.

… “Value-added products are a great way for a small family farm to increase their income,” said Ruth Dahlquist-Willard, a small-farm adviser with the program. Many farmers are accustomed to only selling fresh produce. They plant a diverse set of crops in a small area and sell a little bit of everything. Producing a product that requires the extra step of drying, grinding and storing is a whole new world for many of them.

“I think there's a lot of opportunity there,” Dahlquist-Willard said. She's particularly excited about how a product might bring the younger generation back to their family farms. Kids who have gone off to college for business, marketing or graphic design might see a new kind of future for themselves on the family farm with a product like moringa.

https://ww2.kqed.org/news/2018/01/26/small-farmers-in-fresno-hope-for-big-moringa-payoff/

SLO County's Top 20 Under 40: Meet the 2017 award winners

Katherine Soule
(San Luis Obispo Tribune) Staff, Jan. 26

…Katherine E. Soule, 35, is director of the UC Cooperative Extension for SLO and Santa Barbara counties, where she's earned state and national recognition for improving community health and increasing diversity in youth participation.

As the extension's youth, families and communities advisor for the last several years, Soule developed new 4-H programs engaging underserved youths and promoting healthy living, leadership and social development. Her efforts nearly doubled enrollment and boosted Latino participation 26.8 percent. She's delivered nutrition education to more than 10,000 people through various partnerships.

http://www.sanluisobispo.com/news/business/article196536784.html

Flooding alfalfa for groundwater recharge

(Morning Ag Clips) Jan. 24

A rigorous field study in two California climate zones has found that alfalfa can tolerate very heavy winter flooding for groundwater recharge. The research was published online Jan. 16 in California Agriculture journal.

The alfalfa research is the latest in a series of projects studying the effects of using land planted with permanent crops – including almond orchards and vineyards – to capture and bank winter storm water. Such projects have great promise but also require collaboration across multiple jurisdictions and agencies. UC Agriculture and Natural Resources vice president Glenda Humiston has made groundwater recharge on working lands and open spaces a division priority and is working with water and land use leaders around the state to facilitate it through policy recommendations and cross-agency collaboration.

https://www.morningagclips.com/flooding-alfalfa-for-groundwater-recharge/

Band Canker Affecting Younger Almonds

(California Ag Today) Patrick Cavanaugh, Jan. 24

Brent Holtz is a UC cooperative extension Pomology Farm Advisor for San Joaquin County. He recently told California Ag Today about how the fungus band canker on almonds is becoming more prevalent in the San Joaquin Valley.

“I've seen a lot more band canker, which is caused by a pathogenic fungus, Botryosphaeria dothidea, and we're seeing it on young orchards, especially in in San Joaquin county," said Holtz.  "We've seen that a lot out in the delta and we've seen it in eastern San Joaquin county where the soils tend to be a little heavier, maybe old dairy ground and richer and we don't really know why."

https://californiaagtoday.com/band-canker-affecting-younger-almonds/

CCOF Annual Conference to Focus on Organic Hotspots

AgNet West) Jan. 22

Registration is available for the California Certified Organic Farmers (CCOF) annual conference, Organic Hotspots: Revitalizing Rural America.  The event is scheduled for February 22 and 23 at the Sheraton Grand Sacramento Hotel in Sacramento.…

The event will focus on organic hotspots and how rural economies can potentially be stimulated by organic production.  Topics will include partnerships between elected officials and the organic community, the role of education and research, along with the process of growing organic produce in local communities.  The event will conclude with a keynote speech from Glenda Humiston, Vice President of the University of California Division of Agriculture and Natural Resources.

http://agnetwest.com/ccof-annual-conference-organic-hotspots/ 

California Today: 100 Million Dead Trees Prompt Fears of Giant Wildfires

(New York Times) Thomas Fuller, Jan. 19

The more than 100 million trees that died in California after being weakened by drought and insect infestations have transformed large swaths of the Sierra Nevada into browned-out tree cemeteries. In some areas more than 90 percent of trees are dead.

This week a group of scientists warned in the journal BioScience that the dead trees could produce wildfires on a scale and of an intensity that California has never seen.

…“It's something that is going to be much more severe,” said Scott Stephens, a professor of fire science at Berkeley and the lead author of the study. “You could have higher amounts of embers coming into home areas, starting more fires.”

https://www.nytimes.com/2018/01/19/us/california-today-100-million-dead-trees-prompt-fears-of-giant-wildfires.html

Winter's good time for gopher control in nut crops

(Western Farm Press) Cecelia Parsons, Jan. 17, 2018

Tree nut growers who are plagued by gopher invasions in their orchards need to stick with effective control measures if they want to minimize tree losses.

Pocket gophers are common in most nut production areas, says Joe Connell, University of California Cooperative Extension Farm Advisor Emeritus in Butte County. In the absence of cover crops or weeds, they will gnaw on tree roots and trunks, and the hungry vertebrate pests can even girdle — and kill — older trees. Trees with root damage and girdling will lose production, and will be susceptible to crown gall, which weakens their structural strength.

http://www.westernfarmpress.com/tree-nuts/winter-s-good-time-gopher-control-nut-crops

Bloomington nursery's citrus trees to be destroyed by California agriculture department

(ABC7 KABC) Rob McMillan, Jan. 17, 2018

Roxana Vallejo was 12 years old when her parents opened up Santa Ana Nursery in Bloomington. Wednesday, the California Department of Food and Agriculture will be at her business to destroy almost all of their citrus trees. Vallejo said the combined value of the trees is almost $1 million.

"They're all fine, and look at all the new growth, it's pretty good," Vallejo said.

The reason they're being cut down is huanglongbing, or HLB, one of the world's worst citrus diseases. The insect that spreads HLB has taken a strong foothold in Southern California.

"It's estimated that the citrus industry may go commercially extinct unless they can get a handle on this problem," said Mark Hoddle, UC Cooperative Extension specialist at UC Riverside, more than one year ago.

http://abc7.com/food/ie-nurserys-citrus-trees-to-be-destroyed-by-ca-agriculture-department/2959173/

OPINION: Ranchers give thanks

(Ventura County Star) Beverly Bigger, president of the Ventura County Cattlemen's Association, Jan. 16, 2018

Matthew Shapero
The majority of attention and sympathy have rightly gone toward those who lost their homes in the Thomas Fire, but I would like to take a moment to highlight the story of others who have suffered as well. They are largely invisible, hidden among the hills and canyons, but their contribution to the county is significant.

Ventura County is home to a robust and historic cattle industry, one that makes up a $2 million portion of Ventura County's agricultural sector. Ranchers play an important role in land management as well, their grazing operations clearing overgrown brush, reducing the fuel available to wildfires and protecting nearby communities.

In the space of 12 hours, the Thomas Fire ripped through vital grazing land that cattle rely on for their daily feed. Sadly, some animals were also lost to the fire.

With feed and fencing gone, many ranchers had hard decisions to make regarding the future of their operations, and some were not prepared for this kind of disaster. Thankfully, we have dedicated public servants who stepped up to help the cattle industry.

Ventura County Agricultural Commissioner Henry Gonzales, Matthew Shapero from the UC Cooperative Extension, and Donna Gillesby and Bryan Bray of Ventura County Animal Services all reached out to ask what they could do to help.

An emergency program was put in place to supply five days of hay until ranchers could get on their feet. The UC Extension also provided a one-stop location where ranchers could meet with representatives from multiple agencies to apply for assistance programs.

The assistance of these agencies was very much appreciated. We want to thank and recognize them for helping us in our time of need. We look forward to returning to our passion: managing and improving the land and continuing Ventura County's ranching heritage.

http://www.vcstar.com/story/opinion/readers/2018/01/16/ranchers-give-thanks/1038625001/

Farm advisor tests strategies for controlling horseweed

(Ag Alert) Bob Johnson, Jan. 10, 2018

One morning last summer, University of California Cooperative Extension vineyard weed control advisor John Roncoroni displayed a horseweed plant that had grown to more than 10 feet tall in a Yolo County vineyard.

Horseweed, which is widely seen on the sides of the state's highways, is among the glyphosate-resistant weed pests that can develop healthy populations in even well managed vineyards.

"We're really having problems with weeds coming in the fall that are resistant to Roundup," Roncoroni said. "Willow herb is tolerant; it's never been completely controlled by glyphosate."

http://www.agalert.com/story/?id=11460

Pomegranate returns not so wonderful but largest grower says otherwise

(Hanford Sentinel) By John Lindt, Jan. 11, 2018

A few years ago Central Valley pomegranate growers appeared to be riding a rising tide of popularity for pomegranates spurring optimism about the crop's future. Growers, including those in Kings County, enjoyed prices of over $1,700 a ton as recently as 2011.

After a significant planting of new trees, by 2015 pomegranate tonnage was fetching just $450 a ton in Fresno County and falling to $362 a ton in Tulare County according to its 2016 crop report.

…UC Farm Adviser Kevin Day says it's simple economics. “We are seeing both overproduction and lack of demand for pomegranates despite expectations to the contrary."

http://hanfordsentinel.com/news/local/business/another-ag-co-will-relocate-to-make-room-for-hsr/article_bb81b0e9-ef28-55d9-b80f-f352bea38466.html

Western Innovator: Promoting sustainable ranching

Tracy Schohr
(Western Farm Press) Tim Hearden, Jan. 9, 2018

Tracy Schohr has devoted much of her career to promoting sustainability in ranching.

While at the California Cattlemen's Association, she put on an annual “rangeland summit” that brought ranchers together with environmental experts and climate change policymakers.

She also worked on a program to limit ranchers' risk of facing Endangered Species Act violations if they created habitat on their land.

After going back to school to earn her master's degree at the University of California-Davis, Schohr has become a UC Cooperative Extension livestock and natural resources adviser based in Plumas, Sierra and Butte counties. http://www.capitalpress.com/California/20180108/western-innovator-promoting-sustainable-ranching 

Weed Control with Brad Hanson UC Cooperative Extension Weed Specialist at UC Davis 

(California Ag Today) Patrick Cavanaugh, Jan. 8, 2018

“Weeds are probably one of the year-in, year-out problems that growers face,” said Brad Hanson, UC Cooperative Extension, who discussed herbicide resistance with California Ag Today.

https://californiaagtoday.com/podcasts/brad-hanson-uc-cooperative-extension-weed-specialist-at-uc-davis-on-weed-control/ 

Building blocks for tending flocks

(Auburn Journal) Julie Miller, Jan. 7, 2018

Counting sheep is no longer for the tired and sleepy.

Shepherding has become a booming industry in Placer County. At last count, there are 9,000 head of sheep registered with the county, said Dan Macon, livestock and natural resources advisor for University of California, for Placer and Nevada counties. And there may be more sheep that have not been registered, perhaps because they are in a smaller flock of 10 to 15, he said.

Sheep have proven to be versatile. Not only raised for the meat and milk, but also wool fibers, plus, they can help reduce fire danger by eating away tall grasses and shrubs.

http://www.auburnjournal.com/article/1/06/18/building-blocks-tending-flocks#

After a recent outbreak of E.coli, is it safe to eat romaine lettuce? Experts differ

(Fresno Bee) Robert Rodriguez, Jan. 5, 2018

If you are staying away from romaine lettuce because of an outbreak of E.coli, it's understandable. But at least one food safety expert says it may not be necessary.

…But University of California food safety expert Trevor Suslow said it's unlikely the lettuce you buy at the grocery store these days is going to do you any harm. That's because the illnesses happened from Nov. 15 through Dec. 8. Lettuce sold during that period wouldn't be around anymore.

“It's not going to last that long, it's gone,” Suslow said.

http://www.fresnobee.com/living/food-drink/article193301924.html

Cattle Ranchers Join Conservationists To Save Endangered Species And Rangelands

(Forbes) Diana Hembree, Jan. 5, 2018

…California has a strong incentive to preserve its 18 million acres of ranchland: Cattle and calves are the state's fourth-leading agricultural commodities (milk and cream are No. 1), according to state agricultural data. But in a Duke University survey of the state's ranchers, more than half said they were “more uncertain than ever” that they would be able to continue ranching. California is losing an estimated 20,000 acres of rangeland each year, according to the Nature Conservancy, and on any given day ads for the sale of cattle ranches dot the Internet. The median age of California ranchers is 58 to 62, and more are aging out of the business with no children interested in taking over the ranch.

But this trend can be reversed, according to Lynn Huntsinger a professor of environmental science and rangeland ecology at UC Berkeley. To preserve these landscapes for future generations, ranchers need payment and recognition for their ecosystem services “in order to preserve these working landscapes for future generations,” Huntsinger writes.

https://www.forbes.com/sites/dianahembree/2018/01/05/cattle-ranchers-join-conservationists-to-save-endangered-species-rangelands/#56c2400f220d

Months after Wine Country fires, damaged vineyards face uncertainty

(SF Chronicle) Esther Mobley, Jan. 4

…“No one knows what's the real threshold for heat damage,” says Rhonda Smith, the Sonoma County-based viticulture farm adviser for the University of California, who has come to Gilfillan to consult on its rehabilitation.

Much of the conventional wisdom about how fires interact with vines — that vines can't burn, because of their high water content, for instance — didn't turn out to be true for every vineyard, she says.

“In 99 percent of cases, vines were fire breaks,” says Smith. But if there was dry vegetation, if there was wood mulch on the ground, if the soil was especially dry — if, if, if — then they weren't.

http://www.sfchronicle.com/wine/article/Months-after-Wine-Country-fires-damaged-12474309.php

Progress reported on robotic weeders for vegetables

(Ag Alert) Bob Johnson, Jan. 4

The next generation of computer-controlled, automated cultivators will be able to use cameras to remove weeds in the seed line as close as 1 inch from young tomato or lettuce plants, without damaging the crop.

“It must be more than half the lettuce acreage that is already using the automated thinners,” said Steve Fennimore, UC Cooperative Extension vegetable weed specialist.

Fennimore is supervising the Salinas lettuce trials of “marking” the crop in order to make this technology practical for weeding as well.

“The weeders already out there tend to be prototypes that people are still experimenting with,” he said.

http://www.dailydemocrat.com/article/NI/20180104/NEWS/180109957

2017's natural disasters cost American agriculture over $5 billion

(New Food Economy) Sam Bloch, Jan. 4, 2018

Over a period of 10 months in 2017, America experienced 16 separate, billion-dollar weather and climate-related disasters. Those weather events carved paths of destruction straight through some of the most fertile and productive regions of the country, wreaking havoc on beef cattle ranches in Texas, soaking cotton and rice farms in Louisiana, orange groves in Florida, and burning up vineyards in California. And that was all before Southern California's still-active Thomas fire, which began on December 4, and then closed in on the country's primary avocado farms. It's now the state's largest-ever, in terms of total acreage.

  • Acres of cherimoya trees in Santa Barbara County destroyed by the Thomas fire: 100
  • Total dollar value of Santa Barbara cherimoya fruit damaged by fire: $5,000,000
  • Acres of avocado fields in Santa Barbara and Ventura Counties threatened by wildfire: 5,260
  • Estimated pounds of Hass avocados in Ventura County lost to wildfire: 8,060,000
  • Total dollar value of that lost harvest: $10,175,750
  • Approximate percentage of American avocado crop threatened by wildfire: 8
  • Expected effect of wildfire on avocado prices in America, due to reliance on imports: 0
  • Winegrape acreage in Napa and Sonoma Counties: 104,847
  • As a percentage of total California winegrape acreage: 22
  • Estimated dollar value of unharvested Cabernet grapes in those counties, before the wildfires: $175,000,000
  • Estimated dollar value of those grapes, now tainted by smoke: $29,000,000
  • Bottles of 2016 Napa Cabernet you can buy for the price of two 2017 vintages, due to winegrape scarcity: 3

California wildfire data from Daniel A. Sumner, Ph.D. of UC Agricultural Issues Center, USDA NASS, Ben Faber, Ph.D. of UC Cooperative Extension Ventura.

https://newfoodeconomy.org/2017-natural-disasters-agriculture-damage-5-billion/

There Is No “No-Fire” Option in California
(Bay Nature) Zach St. George, Jan. 2, 2018

As the use of prescribed fire by Cal Fire declined in recent decades, its use also declined with private landholders, says Lenya Quinn-Davidson, director of the Northern California Prescribed Fire Council, who leads prescribed burning workshops across the state. Scott Stephens, the UC Berkeley professor, concurs. Decades of suppression left the western U.S. with relatively few people trained to carry out the work: “We just don't have that experience to pass on.” But it's important not to let the current enthusiasm pass, he says—as climate change continues to push conditions toward extremes, as wildfires consume more and more of fire agency budgets, and as the wildland-urban interface expands, it will only become more difficult to bring fire back.

https://baynature.org/article/no-no-fire-option-california/

Scientist discusses working on Food Evolution movie

(Brownfield Ag News) Larry Lee, Jan. 1

A scientist involved in a movie about genetically modified food says many don't understand what GM is, let alone the benefits.  Alison VanEenennaam says, “Really, it's a breeding method, and I think the public sector applications for things like disease resistance have very compelling societal benefits that I think most people can relate to.  I don't think we want plants and animals getting sick, and if we can solve that problem genetically rather than using chemicals, I think people get that.”

VanEenennaam is a geneticist at the University of California.  She tells Brownfield there is a lot of unnecessary fear about eating genetically modified food.  “The safety around GM (Genetically Modified) has been established and is, you know, agreed on by every major scientific society in the world and yet we've got the vast majority of consumers that don't believe that.”

https://brownfieldagnews.com/news/scientist-discusses-working-food-evolution-movie/

Urban Edge farm program offers immersion-style learning

(East Bay Times) Lou Fancher, Jan. 1, 2018

After operating a pilot version of the ambitious program, a $200,000 grant from the USDA National Institute of Food and Agriculture's Beginning Farmer and Rancher Development Program is a launch pad for the immersive learning experience.

For the first cohort of students, many of them women and/or people of color, immigrants, refugees, veterans or farmers-to-be with limited resources, the land is a classroom. Instruction comes from First Generation and experts from the National Center for Appropriate Technology and UC Cooperative Extension. Participation in the program represents opportunity and fulfills dreams the first-time farmers hold of agricultural avocation, economic stability, families, homesteads and permanence.

https://www.eastbaytimes.com/2018/01/01/urban-edge-farm-program-offers-immersion-style-learning/

Tribute to Paul Verdegaal – one of Lodi's “men behind the curtain”

(Lodi Wine blog) Randy Caparoso, Jan. 1, 2018

This coming February 6, 2018, Lodi winegrowers will get together for their 66th Annual LODI GRAPE DAY. They will also mark the occasion with a celebration of the retirement of Paul Verdegaal, who has been working full-time as San Joaquin County's viticulture, bush berry and almond Farm Advisor under the auspices of UCCE (University of California Cooperative Extension) since 1986.

http://www.lodiwine.com/blog/Tribute-to-Paul-Verdegaal---one-of-Lodi-s--men-behind-the-curtain-

Posted on Wednesday, January 31, 2018 at 1:06 PM
Focus Area Tags: 4-H, Agriculture, Economic Development, Environment, Pest Management

Farmers are disappointed Trump has scrapped TPP

California farmers could have reaped substantial profits if the 12-country Trans-Pacific Partnership had become law, reported Robert Rodriguez in the Fresno Bee, but President Trump pulled the U.S. out of the deal.

According to the American Farm Bureau, California fruit and nut producers could have made $562 million in sales through lower tariffs and the elimination of tariffs. Dairy producers could have made $53 million in additional revenue.

Rodriguez spoke with Daniel Sumner, director of the UC Agriculture and Natural ResourcesAgricultural Issues Center. Sumner said an outcome of Trump's decision may be for the U.S. to negotiate individual deals with Pacific nations.

"Vietnam could prove to be very useful," Sumner said. In Vietnam, a growing middle class is making the country a more attractive destination for California agricultural products.

Trump also promised during the campaign to renegotiate the North American Free Trade Agreement (NAFTA), which Sumner said could prove difficult because Canada and Mexico are key California trade partners.

"When you unilaterally open a trade agreement that has been successful, it can be very scary," Sumner said. "It is a huge market for California."

Trump's decision to withdraw from TPP has significant financial implications for California farmers. (Photos: Pixabay)
Posted on Tuesday, January 24, 2017 at 1:10 PM
Tags: Daniel Sumner (34), TPP (3), trade (11)

Trump presidency and potential impact on food prices

President-elect Donald Trump promised to crackdown on illegal immigration during his campaign. Caitlin Dewey reported in the Washington Post that such a move would result in increased fruit and vegetable prices for Americans.

The Post sought information from the UC Agricultural Issues Center (AIC), a statewide program that is part of UC Agriculture and Natural Resources. UC Cooperative Extension was credited as a source for a chart that accompanied the article that noted the crops most vulnerable to labor-cost change. Asparagus is listed as having the highest proportion of the farms' operating costs dedicated to labor: 82 percent. 

"The plants must be hand cut multiple times per day during their two-month harvest season," the story said. Other crops that have high labor costs are wine grapes, oranges, sweet cherries, and all types of fruit. The article said berries, peppers, onions, watermelons and apples are also typically picked by hand.

A Texas A&M agricultural economist, Luis Ribera, told the reporter he believes U.S. farmers may not be able to produce some fruit and vegetables as a result of Trump's planned deportation of undocumented immigrants.

"We had a farm labor shortage even without Trump. Whatever he does will just compound the problem," Ribera said.

The director of the AIC, agricultural economist Daniel Sumner, doesn't express dire concern about the potential impact of the Trump administration on food prices and agriculture policy.

"I do not see big changes in immigration policy relevant for ag. Except perhaps a guest worker program, which would be positive," Sumner said. "I do not see big deportation of farmworkers coming."

Crops that require hand labor are more vulnerable to price fluctuations when immigration policies change.
Posted on Tuesday, December 6, 2016 at 11:14 AM

President-elect Trump may put his own stamp on TPP

Although President-elect Donald Trump repeatedly said he was against the proposed Trans-Pacific Partnership (TPP) during the presidential campaign, a UC Agriculture and Natural Resources expert says he may moderate his position once he is in office, reported Julia Mitric on Capital Public Radio.

"The Trans-Pacific Partnership is an attack on America's business. It does not stop Japan's currency manipulation. This is a bad deal," Trump was quoted in a 2015 article on CNN.com. TPP was negotiated by the Obama Administration, but is stalled in Congress.

Director of the UC ANR Agricultural Issues Center, Daniel Sumner, said Trump may want to put his own stamp on the deal, and not stop it altogether.

Daniel Sumner, director of UC ANR's Agricultural Issues Center.

"I can imagine President Trump asking for a delay on that until he renegotiates parts of it," Sumner said. "And if he can renegotiate what he considers a better deal, great, and he may well be very instrumental in getting such a thing through Congress."

Paul Wenger, president of the California Farm Bureau Federation, was also quoted in the story. He predicted Trump will consider the merits of TPP. 

"If he's such a good businessman, he will see this is a good deal," Wenger said.

Sumner added, "When there's trade, both sides benefit. Otherwise you don't trade."

 

Posted on Tuesday, November 15, 2016 at 10:09 AM
Tags: Daniel Sumner (34), Donald Trump (2), TPP (3)

How is climate change affecting agriculture? It depends.

If the current trend of warmer winters continues in Yolo County, chill hours may be insufficient for many walnut varieties by the year 2100.

Of 12 crops examined in Yolo County, walnuts are most vulnerable, while processing tomatoes and alfalfa acreage may increase due to warmer winters.

In an effort to forecast how climate change may affect agriculture, University of California agricultural economists looked at how climate has affected crop acreage in the past. The effect of temperature changes on plants depends on local conditions and the crops grown. In a case study of Yolo County agriculture, warmer winter temperatures would reduce chill hours, potentially reducing yields for some crops while extending the growing season for others, according to a University of California study published in the peer-reviewed journal California Agriculture.

Insufficient chill hours can delay the opening of leaf and flower buds in crops such as walnuts, which may result in a smaller yield.
“Growers change crops depending on many factors, including climate change and market conditions,” said Hyunok Lee, lead author and research economist in the Department of Agricultural and Resource Economics at UC Davis. “The challenge was to separate the effects of climate on acreage. To isolate the climate effects from the market effect, we used an econometric model.”

This technique used in Yolo County could be used for projecting the effects of climate change on agriculture in other regions, said Lee.

Using about 100 years of climate data and 60 years of farm acreage, Lee and her co-author looked at the relationships between the evolution of local climate conditions and the acreage of 12 major crops grown in Yolo County. The crops included processing tomatoes, rice, alfalfa, wheat, corn, prunes, grapes, walnuts, almonds, safflower, pasture and other fruit.

“When we look at maximum and minimum temperatures, the minimum temperatures are higher while the maximum temperature stays about the same,” Lee said. “And the lower temperature is rising at a faster rate, especially in winter. That's good for winter crops, but not so good for crops that require chill hours.” Many tree crops require cold for a certain number of hours below a critical temperature, commonly 45 degrees Fahrenheit, to stimulate the growth of leaves and flowers.

Processing tomato acreage, which accounts for 90 percent of vegetable acreage in Yolo County at present, could expand by 14 percent by 2050 if current climate trends persist.
In Yolo County, warmer winters could result in increased rice, tomato and alfalfa acreage while winter wheat could decline.

Among trees and vines, the most sensitive to climate change are walnuts, which require more chill hours. Walnut acreage would decline, Lee said, while there would be a modest change in grape and almond acreage.

Lee emphasized that market conditions exert a great deal of influence on the crops growers choose to plant. Growers who consider trends in climate change may choose different cultivars rather than different crops, such as a walnut variety that requires fewer chilling hours.

Lee and co-author Daniel Sumner, director of the UC Agricultural Issues Center and Frank H. Buck, Jr. Professor in the Department of Agricultural and Resource Economics at UC Davis, based their acreage projections on following the trend of climate change for the past 105 years, but were not able to incorporate climate variability, extreme weather events, accelerated warming or availability of irrigation water in their modeling.

This research, which was part of a larger study of climate change and agriculture funded by a grant from the California Energy Commission, was also supported by the UC Agricultural Issues Center, a program of UC Agriculture and Natural Resources.

Posted on Tuesday, March 22, 2016 at 10:37 AM

Read more

 
E-mail
 
Webmaster Email: kmchurchill@ucanr.edu