Posts Tagged: Tracy Kahn
Among the topics is Asian citrus psyllid (ACP), which is off particular concern to citrus growers at the moment. The exotic pests can spread huanglongbing (HLB) disease, an incurable condition that has already seriously impacted the citrus industries in Florida and Texas. A few trees in urban Southern California backyards have been found infected with HLB and were pulled out and destroyed.
At the citrus field day, UC Agriculture and Natural Resources Cooperative Extension specialist Matt Daugherty will discuss the potential for nurseries to contribute to Asian citrus psyllid and huanglongbing spread. Regulations are in place in California that restrict movement of containerized citrus and require specific insecticide treatments. Daughterty is evaluating how well such steps reduce the risk of human-mediated Asian citrus psyllid spread. He is using a combination of monitoring in nurseries, field experiments on chemical control efficacy, and characterization of the effects of nursery practices on psyllid management.
Another speaker, UC ANR Cooperative Extension specialist Philippe Rolshausen, will explain how bacteria, fungi and viruses associated with plants, either on its surface or inside, can affect plant health and productivity. He will demonstrate how these organisms can be used for disease control using Pierce's disease of grapevines as an example and also drawing a comparison with huanglongbing in citrus.
The event, with a mix of presentations and field tours, is scheduled from 8 a.m. to 3 p.m. Advance registration, which is $25, is required. The deadline is Jan. 22. There will be no day-of-event registration available.
To register visit: https://form.jotform.com/53556635957975. For more information call (951) 827-5906.
The following is a tentative agenda:
- 8 a.m. – Introductions by Peggy Mauk, director of agricultural operations at UC Riverside and a subtropical horticulture extension specialist, and Tracy Kahn, curator of UC Riverside's Citrus Variety Collection.
- 8:10 a.m. – Welcomes from Kathryn Uhrich, dean of UC Riverside's College of Natural and Agricultural Sciences and Michael Anderson, a divisional dean for agriculture and natural resources
- 8:30 a.m. – Minimizing the potential for nurseries to contribute to Asian citrus psyllid spread in California – Matt Daugherty, UC ANR Cooperative Extension specialist, entomology.
- 9:15 a.m. – Microbiota-based approach to citrus tree health – Philippe Rolshausen, UC ANR Cooperative Extension specialist, subtropical horticulture.
- 9:45 a.m. – Low seeded citrus – variation in seed content and its causes – Mikeal Roose, professor, botany and plant sciences at UC Riverside. Roose specializes in plant breeding, particularly with citrus.
- 10:30 a.m. – Break
- 11 a.m. – Novel detection methods for Huanglongbing – Wenbo Ma, associate professor, plant pathology at UC Riverside .Her research is focused on developing methods that detect Huanglongbing by monitoring so-called “effectors” secreted from the bacterial pathogens causing the disease.
- 12 p.m. – Lunch (catered by Anchos Southwest Grill).
- 1 p.m. – Pesticide safety training – Vince Samons, UC Riverside agricultural operations.
- 1:45 p.m. – Walk-through of the Citrus Variety Collection, rootstock trial and phytophthora root rot trial.
To make a tax-deductible contribution to the Citrus Variety Collection Endowment fund or the Citrus Research Center & Agricultural Experiment Station support fund go to the following link and select College of Natural and Agricultural Sciences then select the specific fund: https://advancementservices.ucr.edu/GivingForm.aspx
A new UC Riverside citrus hybrid - combining the best traits of pummelo, mandarin and blood orange - could eventually become an ideal and healthful Valentine's Day present.
Valentine pummelo hybrid merges the large size and low acidity of Siamese Sweet pummelo, complex floral taste from Dancy mandarin and juicy red pulp from Ruby blood orange.The fact that the fruit matures in mid-February, near Valentine's Day, isn't the only reason it was given the nickname 'Valentine.' Cutting the fruit lengthwise and turning it upside-down reveals flesh that looks a little like a vibrant red heart.
The new Valentine hybrid is also an excellent eating fruit.
"It has a complex flavor that is different from the most common pummelo, Chandler," said Tracy Kahn, senior museum scientist with the UC Riverside Citrus Variety Collection. "It is sweeter and floral and the bright red streaking pigmentation adds to the experience."
The fruit is unique in being grapefruit sized and containing anthocyanin pigmentation. Anthocyanin, an antioxident that gives the fruit its deep red color, may diminish the risk of heart disease, some types of cancer and LDL cholesterol accumulation.
Budwood for the new hybrid was released by UC Riverside to nurseries in 2009. A few retail nurseries will have a small quantity of Valentine trees this year; more are coming in the future.
"Valentine will be a specialty crop, for sure, and will probably be sold for restaurants, in farmers markets and specialty grocery stories once a year, at the peak of its season, around Valentine's Day," Kahn said.
How to eat this new fruit cocktail? Kahn suggests cutting off the top and bottom of the fruit, sliding off the rind, peeling off the pith and cutting out the sections inside the membranes with a knife.
Valentine on the tree.
Yearly per capita consumption of grapefruit has been on a steady decline since the late 1970s, according to an article in the Riverside Press-Enterprise. To boost the fruit's popularity and keep the industry in business, growers in Southern California have organized a cooperative and hired PR expert Kari Birdseye to put together a marketing program.
In 1976, Americans ate almost 9 pounds of grapefruit per year. As a late-baby boomer, that doesn't come as a big surprise to me. The popular "grapefruit diet" was one of the first weight-loss fads I can remember. By 2007, per capita consumption dropped to 2.76 pounds, the article said.
Birdseye told Press-Enterprise reporter Leslie Berkman that one of the cooperative's goals is to extend the appeal of grapefruit to the younger set. In the U.S., it seems to be eaten by people who are middle-aged and older.
Another issue is that warning labels on some drugs for lowering cholesterol and blood pressure say they should not be taken with grapefruit juice. Birdseye said she is enlisting scientists at UC Berkeley to review the research that has been done on the interaction of grapefruit with drugs and on the nutritional benefits of grapefruit, such as in fighting obesity, Berkman reported
"The first step is to do a comprehensive review of the scientific literature to determine what health benefits can be authentically claimed and to see where there might be some holes where more research is required," Birdseye was quoted. "Let's get the science behind us."
According to the article, Birdseye is planning to meet with Thomas Baldwin, dean of the College of Natural and Agricultural Sciences at UC Riverside, to find ways UCR experts can help grapefruit growers, such as by breeding grapefruit varieties to enhance existing health benefits.
Tracy Kahn, curator of the UCR citrus variety collections, noted in the story that one reason for the growing popularity of pink grapefruit is that the pigment that makes it rosy, lycopene, is very healthful.
Pink grapefruit (Photo: Wikimedia Commons)