Cooperative Extension Fresno County
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Cooperative Extension Fresno County

Posts Tagged: citrus

Taste a colorful rainbow of citrus at UC research facility

Hundreds of different citrus varieties are available for tasting at last year's citrus tasting event.
The UC citrus research center swings open its doors this week to give farmers and the public the opportunity to view and taste dozens of mandarin varieties - which in recent years have emerged as Americans' favorite citrus – as well as sweet oranges, lemons, grapefruit, kumquats, blood oranges, tangors and many other types of citrus fruit.

The 175-acre UC ANR Lindcove Research and Extension Center is situated where the valley and Sierra Nevada foothills meet in eastern Tulare County. Research conducted at the center plays a major role in maintaining California's position at the forefront of high-quality citrus production for markets throughout the United States and the world.

Citrus Industry Day - Dec 12: From 9 a.m. to 12 noon, citrus growers, pest control advisers and other industry professionals are invited to taste citrus fruit at their leisure, discuss new low-seeded mandarin varieties with UC Riverside plant breeder Mikeal Roose, and consult with UC Cooperative Extension advisors Neil O'Connell of Tulare County and Craig Kallsen of Kern County. At 10 a.m., UC Riverside plant pathology specialist Georgio Vidalakis, director of the UC Citrus Clonal Protection Program, will explain the center's role in providing the citrus industry with disease-free citrus propagative material. Immediately following the CCPP presentation, UC Riverside principal museum scientist Tracy Kahn will lead a tour of the Lindcove demonstration orchard and discuss new citrus varieties.

General Public Day – Dec 13: From 9 a.m. to 12 noon, Lindcove is open to the public. In addition to citrus tasting, there will be a special activity for children and the opportunity to consult with UCCE Master Gardeners about backyard citrus horticulture and pest management. The tasting event is free. Visitors wishing to take home samples of Cara Cara, Washington navels, mandarins and assorted fruit, may purchase a tote bag full of fruit for $5. All funds raised by the bag sales will supplement educational activities at the center.

At both events, Mary Lu Arpaia, UC Riverside post harvest specialist and David Obenland, plant physiologist at the USDA-ARS San Joaquin Valley Agriculture Center, will be inviting visitors to participate in a research project that involves taste testing of citrus fruits.

The weekend's events mark the launch of Lindcove's Conference Center Outdoor Enhancement Campaign. Funds will be used to upgrade the conference center parking area, plant demonstration orchards and add an outdoor amphitheater where school children can learn about citrus.

“We want to increase our outreach to the community,” said Beth Grafton-Cardwell, Lindcove director and UC Riverside citrus entomology specialist. “These planned improvements will enhance our ability to accommodate school children, tour groups and community organizations for educational experiences at Lindcove.”

The Lindcove Research and Extension Center is at 22963 Carson Ave., Exeter. The tasting takes place in the conference center building, located at the end of Carson Ave. on the right. For more information about the tasting events, contact Anita Hunt, (559) 592-2408, ext 151, amdhunt@ucanr.edu.

The University of California Global Food Initiative aims to put the world on a path to sustainably and nutritiously feed itself. By building on existing efforts and creating new collaborations among UC's 10 campuses, affiliated national laboratories and the Division of Agriculture and Natural Resources, the initiative will develop and export solutions for food security, health and sustainability throughout California, the United States and the world.

Posted on Tuesday, December 9, 2014 at 6:47 PM

About that lemoncello

One of the hazards of contributing to a shared blog, is that one forgets to post. So in this case, while I said in my last post that we would re-visit the lemoncello in mid-May, here it is September.  Time flies.

The lemoncello is a huge success, we've been enjoying it on the hot summer afternoons that are plentiful in Davis.  And here's how I got from pith to pleasure . . . .

The first steps in the lemoncello process were documented in this early Spring post.  The recipe calls for 6 weeks of steeping the lemon zest in the alcohol in a cool, dark place; preferably, in a place where it won't be disturbed.  I had placed mine in a place so cool, dark, and undisturbed it took me 45 minutes to find it.

But that resolved, I moved to the next step - filtering.

You can see that the zest from all of those lemons has settled to the bottom of the bottle.  Lemoncello aficionados recommend a 2-step filtering process.  The first step is to get most of the zest out using a fine sieve.

Look at all of this zest!

Quite a bit of solid material is left in the liquid after this process.

To remove these last solids, the liquid is filtered through a paper coffee filter. (Lemoncello purists, like coffee purists, would object to the use of a paper filter, saying it imparts a paper flavor.)

The next step is to add the cooled simple syrup.  The basic simple syrup recipe calls for equal parts of sugar and water, but for lemoncello less sugar is used.  For one 750ml bottle of base alcohol, you need 2-1/2 cups of water and 1-3/4 cups sugar.  Add the sugar to the water in a medium saucepan and heat over medium heat.  Bring to a gentle boil, stirring constantly, until the sugar is dissolved.  Let the mixture cool completely to room temperature before adding to the lemoncello base.

Decant the mixture, and put in a cool, dark place for another 45 days.  The addition of the simple syrup increases the volume, so you can't fit your mixture into the original bottle.

This mixture was moved into two tall glass bottles and set aside until early July.

You can put the finished lemoncello in the freezer or in the refrigerator.  Enjoy it alone or in a cocktail on a hot summer afternoon when you need a little something refreshing!

If you want to make your own lemoncello, an excellent resource is the blog LemoncelloQuest.

Posted on Tuesday, September 9, 2014 at 2:57 PM
Tags: alcohol (2), citrus (12), lemons (2)

Lemons are the zucchini of winter - take 2

It's early spring, and that means one thing: I am once again drowning in lemons.  This year with our tree well established, we had a bumper crop.  Even as an espalier, our tree produces more lemons than we can use.  And as anyone with a lemon tree knows - it's almost impossible to give away lemons. Lemons are the zucchini of winter.

The author's backyard lemon tree trained in espalier style.

With a pantry full of marmalade, a batch of salted lemons preserving, and all of the copper gleaming, I was looking for a new way to use my harvest.  A neighbor told me she distributed all of her lemons by having a lemoncello making contest with her friends. Lemoncello, the Italian lemon liqueur, is gaining popularity outside of Italy.  It uses a lot of lemons and is easy to make.

The basic recipe for lemoncello is the same. Lemon zest, alcohol, simple syrup, and time.  While recipes vary little, proportion and procedures are highly guarded secrets of the cognosenti.

Purists insist on using a base of grain alcohol; it imparts no flavor of its own to the lemoncello letting the lemons shine through.  Where grain alcohol is unavailable, a high quality vodka can stand in.  I chose a hand crafted corn based vodka, distilled 6 times, because corn seemed the closest to grain alcohol and it had a relatively high proof.

For my first try, I am halving the basic recipe. The first step was to zest the lemons. A lot of lemons.

A microplane is a must-have tool as you want pure zest with no pith.

Add the liquor to the lemon zest. Put it a cool, dark place. Wait. 45 days.

See you mid-May for the next step.

P.S. After the original mixing of the lemon zest and the vodka, and on an apéritif roll, we decided to make vin de pêche using the recipe from Chez Panisse Fruit.  The large glass jar photographed above was re-purposed for the vin de pêche, and the vodka and the zest were moved into the empty vodka bottle. This is probably a better solution as there is less air surface in the container.

Posted on Tuesday, April 8, 2014 at 8:57 AM
Tags: alcohol (2), citrus (12), lemons (2)

Cultivating California

Only in California could arid land be converted into the nation’s salad bowl.

In the late 1800s, University of California researchers discovered how to remove salts from the soils of the Central Valley, turning it into one of the most productive agricultural regions.

UC researchers continue to play a key role in agriculture today, keeping California the nation’s leading agricultural state, from dairies in Tulare to nut farms in Newberry Springs.

A new brochure highlights the breadth of UC Agriculture and Natural Resources’ impact. UC guidelines have helped farmers boost broccoli production. UC scientists have developed sweet-tasting citrus and strawberries to meet consumer demands. UC certifies more than 95 percent of wine grapevines grown in the state, providing a reliable supply of high-quality vines for California’s multibillion-dollar wine industry. Whether it’s managing invasive pests, promoting nutrition or sustaining small farmers, ANR serves California’s communities with a focus on advising, educating and searching for solutions.

For more information, read the Cultivating California brochure.

uc anr minibrochure cover s2
uc anr minibrochure cover s2

Posted on Tuesday, May 1, 2012 at 8:14 AM
Tags: broccoli (1), citrus (12), dairy (1), food (1), fruit (2), nutrition (1), nuts (1), small farms (1), strawberries (1), vegetables (1), winegrapes (1)

Genetic engineering for roots — not fruits

Even though U.S. consumers routinely buy and eat genetically engineered corn and soy in processed foods — most are unaware of the fact because the GE ingredients are not labeled.

When consumers are asked in surveys whether they would buy genetically engineered (GE) produce such as fruit, most say they would not buy GE produce unless there were a direct benefit to them, such as greater nutritional value.

Consumer concerns about GE fruit are a factor discouraging commercialization. Plums shown are engineered to resist plum pox virus; they have received regulatory approval, but have not come to market.
Consumer reluctance to buy GE fruits and nuts is a major obstacle to commercialization of these crops in California. To date, no such crop has been brought to market in the golden state, although many have been researched and are being developed.

Yet with continuing invasions and spread of exotic insects and diseases for which there is no known control, the potential importance of trees or vines with some form of genetically engineered resistance is on the rise. In California, such diseases include Pierce's disease in grapes, crown gall disease in walnuts, and the invasive citrus greening (huanglongbing or HLB) in citrus.

"These are potentially devastating diseases to California growers, who produce 70 percent of the fresh fruit and nuts for the entire United States," notes Victor Haroldsen, scientific analyst at Morrison and Foerster, in the current California Agriculture. "They are also a mainstay of the California economy. Fruit and nut tree crops accounted for one-third of the state's total cash farm receipts, or $13.2 billion in 2010."

Now, however, Haroldsen reports that there may be a way to satisfy both consumers and growers — called "transgrafting."

Wild-type (left) and GE (right) walnut microshoots, after inoculation with crown gall-inducing virus. The wild-type shows tumor growth; the GE microshoot on the right does not. Transgrafting allows disease resistance to protect the plant while maintaining non-GE nuts.
Transgrafting combines an old practice with a new technology. For decades, it has been established practice in commercial orchards and vineyards to graft "scions," the fruit-producing budwood, onto "rootstock," the roots and trunk.

"In transgrafting the genetically engineered rootstock can potentially confer the whole plant with resistance to disease. Yet the rootstock does not transfer the modified genes to the fruits or nuts produced," said Haroldsen.

Although over 10 years old, transgrafting technology is just now nearing commercialization, partly due to the long generation times of most trees and vines. Two such transgrafting applications are:  a crown gall-resistant walnut rootstock, and a grape rootstock that confers moderate resistance to Pierce's disease.

"The key advantage of transgrafting is that the plant's vascular system can selectively transport across graft junctions the proteins, hormones, metabolites and vitamins from the roots without changing the heritable genes or DNA sequence in the fruit or nut." says Haroldsen.

In recent research at UC Davis, Haroldsen (a former graduate student) and his colleagues  confirmed that modified DNA and full-length RNA from the rootstock does not cross the "graft union" into the scion, in the walnut and grape applications, or in a tomato model of these two systems.

"These current GE applications address root or xylem pests and diseases, but future applications will likely target traits aimed at consumer needs such as increased nutritional value or improved flavor," said Haroldsen. "If perceived risks to personal health and the environment could be reduced, genetic engineering could benefit not only growers but Californians around the state," he adds.

Posted on Wednesday, April 25, 2012 at 4:01 PM
  • Author: Janet L. White

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