California Fruit and Vegetable

Category: Citrus

  • Results from New Citrus Rootstock, Scion Combination Experimental Grove on HLB Tolerance

    As citrus growers in the west dreadfully anticipate the arrival of the citrus killing disease Huanglongbing, researchers in the already severely impacted state of Florida are making significant strides in learning how to combat this disease.

    Early results from a groundbreaking, large-scale citrus trial looking for solutions to the devastating citrus greening disease have given early hope for growers in the Indian River District. The new UF/IFAS research shows tree size does not seem to affect citrus susceptibility to greening.

    In the trial, researchers are testing which citrus rootstock and scion combinations will tolerate citrus greening, a deadly global citrus disease that nearly decimated the Florida citrus industry.

    Martin Zapien on one of the Millennium Block citrus cultivar trial planting days in 2019.

    Martin Zapien, a graduate student at the University of Florida Institute of Food and Agricultural Sciences Indian River Research and Education Center (UF/IFAS-IRREC), presented data from the Millennium Block citrus cultivar trial in Fort Pierce, Florida. At his thesis defense, the information Zapien represented was research from a 20-acre grove with grapefruit, navel orange and mandarin cultivars on a wide range of newly released and commercial rootstocks. Planted in 2019, the trees grow in a region where citrus greening is now endemic.

    Lorenzo Rossi, UF/IFAS plant root biologist and Tom James, a local citrus industry veteran, supervised Zapien’s research. Advisors on the project were UF/IFAS plant improvement team faculty Fred Gmitter, Jude Grosser and William Castle.

    Nearly 80% of Florida’s grapefruit crop is produced by Indian River District growers, who export their crop to Europe and Asia. That’s why scientists study the fruit so closely, said Rossi.

    “One of our objectives is to evaluate and compare the early performance of several new grapefruit hybrids grown on three commercial rootstocks under citrus greening conditions,” said Zapien.

    In the first two years of growth, the researchers compared UF rootstocks and scions by measuring tree growth and the trees’ ability to tolerate citrus greening. They expect to collect yield and fruit data after the third year, Zapien said.

    Rossi said data sets were specific to tree size, bacteria amount, the severity of citrus greening symptoms such as irregular yellow patches in the leaves, and leaf and soil nutrient concentrations.

    “We have seen many rootstocks that promote large and small tree size, but we have not seen any correlation between tree size and susceptibility to citrus greening,” Zapien said.

    But so far, the research does not support a theory that tree size affects citrus greening susceptibility, but there is a trend in small trees showing less citrus greening symptoms, Zapien said.

    Zapien said published research findings prove that high-density plantings produce higher fruit yields by increasing yield efficiency — fruit number per green foliage. The researchers will evaluate if the trees correlate with the published work or if the larger trees in the test grove produce more fruit.

    ‘Ray Ruby’ grapefruit on UFR-15 rootstock promotes vigorous trees — the trees show the largest canopies and are already flowering. But for UF/IFAS researchers to recommend a particular rootstock and scion combination, more data are required. The experimental grove must be examined for up to four more years before UF/IFAS scientists can make reliable recommendations.

    “All trees in the Millennium Block are infected with citrus greening. However, some trees are thriving,” Zapien said. “Trees on sour orange have shown significantly fewer disease symptoms than trees on x-639 and US-942 rootstocks, but we have to consider that sour orange’s drawback is the susceptibility to citrus tristeza virus.”

    As to citrus greening severity, ‘Star Ruby’ grapefruit showed only 4% symptoms in the green foliage. In contrast, ‘US Seedless Surprise’ symptoms were 24%. The other varieties fall between the two.

    “The data we compiled is nascent as the trees were only two years old at the analysis,” said Zapien. “University researchers will continue to monitor the top performer combinations to determine if the early findings are consistent.”

    With research in the UF/IFAS-IRREC experimental grove, Zapien completed a master’s degree in horticultural sciences. Zapien recommends that researchers improve sampling methods to assess the bacteria as the trees mature to advance the research. Zapien and his colleagues will evaluate flowering patterns to determine when the fruit is ready to harvest and reveals market windows. A long-term goal is to measure the yield or the amount of marketable fruit each tree produces. — By Robin Koestoyo, University of Florida, Institute of Food & Agricultural Sciences

  • Navel Oranges Dominate CA Citrus Production, Mandarin Acreage on the Rise

    The Pacific Regional Office of the USDA’s National Agricultural Statistics Service (NASS) conducts an acreage survey of California citrus growers as funding is available. The purpose of this survey is to provide bi-annual citrus acreage, which includes information on new plantings and removals. It is the continuation of a long series of industry-funded Citrus Acreage surveys. Resulting data reveals that the navel orange by far continues to dominate California citrus acreage and production; however, while bearing acreage of navels has been on a decline, mandarins and mandarin hybrids are trending higher than in previous years, with a significant amount of nonbearing acreage in the ground this year.  Overall, the industry has seen an increase in citrus acreage over the past couple years in the state.

    Users are cautioned that this report consists of two parts:

      • ➢  Table1 shows estimated statewide bearing acreage for the 2018-19, 2019-20 and 2020-21 seasons.

      • ➢  Tables 2, 3, and 4 show detailed acreage data by type, variety, and year planted — as voluntarily reported by citrus growers and maintained in NASS’ database.

    With perfect information, the estimated statewide bearing acreage and the detailed acreage data would be the same. Generally, this will not be the case for the following reasons:

    • ➢  A voluntary survey of approximately 5,400 citrus growers is unlikely to ever attain 100 percent completeness.

    • ➢  It is difficult for USDA/NASS to detect growers who are planting citrus for the first time. 

    PROCEDURES

    The major source of the citrus detailed acreage data was a questionnaire mailed to all citrus growers currently in NASS’ database. The mailing was sent in January 2022. The questionnaire contained previously reported crop, variety, and acreage information preprinted. Producers were asked to update the information with new plantings, removals, and any other corrections. New growers were mailed a blank questionnaire. Growers were given about eight weeks to respond by mail. A telephone follow-up was then undertaken. Data collection ended in July 2022.

    To arrive at the estimated statewide bearing acreage, the NASS citrus acreage database was compared with pesticide application data maintained by County Agricultural Commissioners and the Department of Pesticide Regulation.

    ACKNOWLEDGMENTS

    The USDA, NASS Pacific Regional Office sincerely appreciates the many orchard operators, owners, and management firms that provided their acreage information. Funding for the survey was provided by the California Citrus industry.

  • Citrus Research Board Secures Immense Support from Citrus Growers

    California citrus growers voted to continue their support of the Citrus Research Board (CRB) by a broad margin in a state-mandated referendum.

    The just-concluded referendum, which must be held every five years, was conducted by the California Department of Food and Agriculture (CDFA). A majority of eligible citrus producers cast their vote and their support was nearly unanimous – 97.80 percent, representing 99.51 percent of the state’s citrus volume, voted in favor of continuing the CRB.

    CDFA Marketing Branch Chief Joe Monson said, “Since the referendum results exceed the criteria required for continuation stated above, the Department has authorized the Program to continue operating for another five-year period, through September 30, 2027.”

    Over the past five years, the CRB has worked continuously to advance findings within our four research priorities: vectored diseases, pest management, production and post-harvest technology, and new varieties. Much of the research has focused on the deadly disease huanglongbing (HLB) and advancements have been made to keep the infections from spreading in California. The disease has devastated other citrus growing regions, including Florida, but the diligence of California’s growers has kept HLB from entering any of the state’s commercial groves.

    “We are pleased to once again receive the support of the industry,” said CRB President Marcy L. Martin, “and we look forward to continually improving upon the scientific pillars that allow the California citrus industry to thrive.”

    The CRB administers the California Citrus Research Program, the grower-funded and grower-directed program established in 1968 under the California Marketing Act as the mechanism enabling the State’s citrus producers to sponsor and support needed research. More information about the Citrus Research Board may be found at www.citrusresearch.org.

  • Asian Citrus Psyllids Found in Fresno County

    The California Department of Food and Agriculture’s Plant Pest Diagnostic Center (PPDC) has identified two Asian citrus psyllids (ACP) on a glassy-winged sharpshooter trap from a packinghouse in the Orange Cove area of Fresno County. This has been the first time that the ACP has been detected in Fresno County since November 2019.

    Following confirmation of the ACP detections, agricultural staff from the Citrus Pest and Disease Prevention Division (CPDPD) began conducting a survey and subsequently collected additional suspect ACP adults and nymphs from trees on the packinghouse premises, which were sent to the PPDC for identification.

    All residential properties with host plants within 400 meters of the detections in Fresno County will be treated to prevent ACP population spread. Any growers who are located within 800 meters of the detection site will be notified by the Fresno County Grower Liaison Teri Blaser.

    Following an increase in recent ACP detections across the Central Valley, including in Tulare and Kern counties, growers, packers, haulers and all citrus industry members are encouraged to be extra vigilant in their ACP mitigation steps and adherence to regulatory practices.

    Questions?
    Contact your regional grower liaison for the latest information on detections near you and coordinated or area-wide treatment schedules. Find your grower liaison here.

    Citrus Pest & Disease Prevention Program

  • Citrus Growers Encouraged to Increase Vigilance Following Recent ACP Detections in Central Valley

    Following recent Asian citrus psyllid (ACP) detections in the Central Valley over the last few weeks, growers, packers, haulers and all citrus industry members are encouraged to be extra vigilant in their ACP mitigation steps and adherence to regulatory practices.

    Recently, multiple ACP were detected on traps at a packinghouse in the Woodlake area of Tulare County. Upon confirmation, visual delimitation surveys began the following day. Live adults or nymphs were found and collected at two more adjacent properties, including an abandoned parcel with citrus host plants. CDFA is working closely with the packinghouse to ensure regulatory compliance. Treatment of host plants on residential properties within 400 meters of the detection will be conducted by CDFA once all necessary notifications, emergency proclamations and public meetings have been held. Commercial citrus operations within 800 meters of the detections will be asked to conduct treatments as well.

    Additionally, one ACP was recently detected on a trap at a juice plant in Visalia, and upon completion of the visual delimitation survey of the find site and adjacent properties, there were no additional finds.

    In Kern County, three ACP trap detections have been identified in the last week. One in the city, and two in rural residential locations in Southwest Bakersfield. These are the first ACP detections found in Kern County since November 2021. CDFA teams have already begun delimitation surveys and treatments will be conducted on residential properties with host plants within a 50-meter area around the detections once proper notifications, emergency proclamations and public meetings have been held. There are no commercial operations for several miles around the Kern County detections.

    These detections are a resounding reminder to continue to follow ACP mitigation best practices and regulatory requirements to efficiently suppress ACP populations and prevent the spread of Huanglongbing to the Central Valley.

     

    If you suspect ACP or Huanglongbing in your orchard, please notify the California Department of Food and Agriculture Pest Hotline at 1-800-491-1899. For questions, contact Kern County Grower Liaison Judy Zaninovich at jsleslie@msn.com, Northern Tulare County Grower Liaison Teri Blaser at tblasersci@ocsnet.net or Southern Tulare County Grower Liaison Jessica Leslie at jess.leslie@hotmail.com.

  • Fruit World Reports High Quality, But Lower Volume, For Early Season Central Valley Stone Fruit

    Fruit World, a family-owned, values-driven grower-shipper of organic and conventional fruit, has been harvesting and shipping delicious organic apricots and cherries since mid-April from their Central Valley orchards. “The March freeze tempered early stone fruit production volumes throughout California, especially compared to the banner year we had in 2021,” explained CJ Buxman, Fruit World co-founder. “Fortunately, the fruit that set is looking good, and all our ranches are yielding great product.”

    Severe weather events this spring impacted California’s cherry crops substantially. “We have been extremely fortunate that our organic cherries from the Patterson area were eleven days earlier than last year and had exceptional quality and a larger peak size. We will finish shipping our cherries by the end of next week with Corals, Brooks and Tulares,” said Fruit World Director of Sales, Cindy Richter.

    As a family operation that is focused on quality and sustainability, Fruit World continues to expand their use of cardboard punnet clamshells. “We have found many of the consumers who are seeking premium fruit, especially organic varieties, are also seeking out more sustainable packaging options,” reveals Bianca Kaprielian, Fruit World co-founder and CEO.

    Grower partnerships have been key to Fruit World’s growth and success. “We are fortunate to have formed long-term relationships with several growers who share our values, dedication to farming, and approach to business,” Kaprielian said. “Blossom Hill’s apricots and Masumoto Family Farm’s peaches and nectarines allow us to provide more varieties, higher volumes and longer seasons of top-notch fruit. They are seamless brand extensions, and fully integrated into the Fruit World family.”

    “No farmer works alone. We depend on partners like organisms in the living soil, good neighbors, talented farm workers, to name a few,” said Nikiko Masumoto, fourth-generation farmer and artist. “Fruit World is one of our loyal partners. We get to focus on what we do best in the fields and Fruit World helps us find a home for our fruit. We couldn’t do it without them!”

    Today’s consumers are thoughtful about the environment and sustainability, and appreciate high-quality fruit packed with flavor. Delight them with extraordinary organic cherries, apricots, peaches and nectarines, all grown by family farms, and available from Fruit World.

    For more information or to place an order, call (559) 650-0334, or visit fruitworldco.com to learn more about the Fruit World story.

  • UCCE Experts Share the Latest in Olive Disease Management

    UC Cooperative Experts shared their latest research findings in olive disease management at the recent Olive Oil Day held by the Olive Oil Commission of California (OOCC) in Stockton.

    Jim Adaskaveg, Professor in the Department of Plant Pathology at UC Riverside joined the meeting by video to present his work on epidemiology and management of olive knot and the evaluation of new fungicides for control of olive leaf spot and Peacock Spot. Dr. Adaskaveg has been working with the OOCC for years and has during this time identified a number of promising products for the control of olive knot. The objective is to have a number of products with different active ingredients/ modes of action so that pathogens are unlikely to develop resistance.

    Since these products are not registered on olives, an important part of his work now is on the regulatory side, seeing these products through the EPA process called IR-4. Unfortunately, one of the promising fungicides for Peacock Spot, Ziram (active ingredient ziram), was suddenly cancelled on all crops in February 2022.

    There are additional products in process, including Syllit (a.i. dodine); a decision is expected in October of this year. There is also a product that was previously rejected, Topsin-M (a.i. thiophanate-methyl), that is now back in consideration. In all there are five new fungicide registrations expected.

    For control of olive knot, a number of products have proven effective in the research. Some of these are GRAS (generally recognized as safe) food additives and some are antibiotics (kasugamycin and oxytetrcycline). In order to increase efficacy and reduce the danger of resistence, the most promising approach apprears to be a mixture of chemicals with different modes of action. The food additives do not require complex approvals but the antibiotics are in IR-4. There have been multiple setbacks, but a decision is now expected in December this year for kasugamycin and in March of 2023 for oxytetracycline.

    Mohammed Nouri, UCCE Orchard Systems Advisor presented an investigation of decline symptoms of super-high-density oil olives in the San Joaquin Valley. There are multiple causes of tree decline in CA, including Verticillium wilt, Botryosphaeria, Pleurostoma, Eutypa lata and freezing temperatures; accurately diagnosing these in the field can be very difficult. Consult your local UCCE office or mnouri@ucanr.edu for guidance regarding sampling.

    Dr. Nouri also spoke about the ongoing challenge of Neofabraea. This disease particularly affects the Arbosana cultivar, causing leaf and twig lesions. The infection primarily occurs in wounds caused by mechanical harvest damage but can also appear as spotting on fruit. Research has shown some control with a few fungicides that are in IR-4 for Peacock spot as well. A final optimistic result from a survey of anthracnose in CA found that this disease is not found in commercial CA orchards. It is unlikely to become a significant problem because of low humidity, dry summers, resistant cultivars and a tendency to harvest early.

    Find the full research presentation on the epidemiology and management of olive knot and the evaluation of new fungicides for control of olive leaf spot and Peacock Spot here. — By the Olive Oil Commission of California

  • Citrus Canker in Nursery Stock Sold to CA, CDFA & USDA Take Action to Identify & Destroy Affected Plants

    Citrus Pest & Disease Prevention Program — The United States Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) has confirmed the presence of citrus canker disease in a nursery in South Carolina. The nursery sells plants to consumers through online sales, including four locations in California since August 2021. Retail nurseries did not receive these plants.

    Citrus canker causes citrus leaves and fruit to drop prematurely, and results in lesions on citrus leaves, stems and fruit. Fruit infected with the bacterium that causes citrus canker (Xanthomonas axonopodis) is safe to eat, but it may not be marketable because of the lesions. The disease affects all citrus varieties. Citrus canker is not harmful to people or animals.

    Together with state partners, APHIS is working to collect and destroy the plants shipped to consumers in 11 states and trace plants that were sold to determine additional locations of potentially infected plants. The states include Alabama, California, Florida, Georgia, Louisiana, Mississippi, Nevada, Oregon, South Carolina, Texas and Washington.

    The California Department of Food and Agriculture (CDFA) was notified that four residential properties throughout the state had ordered citrus nursery stock from the South Carolina nursery. Upon being notified of the recall, CDFA staff successfully verified that one order was not filled, removed and destroyed the recalled trees from two of the three remaining residential properties and is working to connect with the recipients of the final shipment (as of March 9). All additional host plants on these properties were surveyed and sampled for citrus canker disease and submitted for analysis, and delimitation surveys will also be conducted around these locations. These swift actions by APHIS and CDFA are focused on protecting the citrus industry as well as nurseries and other establishments that sell citrus plants wholesale and direct to consumers.

    Currently, citrus canker is found throughout Florida and in limited areas of Louisiana and Texas. APHIS is working with state partners to contain the disease, and federal and state quarantines exist in these states. Additionally, citrus canker was recently confirmed in Alabama, and APHIS is working with state partners to establish a federal quarantine to parallel the state quarantine.

    If you live in one of the 11 states and bought citrus plants online that came from South Carolina between Aug. 5, 2021 – Feb. 17, 2022, please keep your plants for now. If you purchased a plant or plants that might be infected, APHIS and/or state officials will contact you in the next several days to collect and properly dispose of any plants purchased from the nursery. You can also call your local USDA office with additional questions. Contact information can be found at www.aphis.usda.gov/planthealth/sphd.

    To learn more about APHIS’ regulations for citrus canker, please visit https://www.aphis.usda.gov/aphis/ourfocus/planthealth/plant-pest-and-disease-programs/pests-and-diseases/citrus/citrus-canker.

    For questions about citrus canker in California or other pests or diseases, please call CDFA’s toll-free Pest Hotline at 1-800-491-1899.

  • Fresno County Vacancy on Citrus Pest & Disease Prevention Committee

    The California Department of Food and Agriculture is announcing one vacancy on the Citrus Pest and Disease Prevention Committee. The Committee advises the CDFA Secretary on activities associated with the statewide citrus specific pest and disease work plan that includes, but is not limited to, outreach and education programs and programs for surveying, detecting, analyzing, and treating pests and diseases specific to citrus.

    The members receive no compensation but are entitled to payment of the necessary travel expenses in accordance with the rules of the Department of Personnel Administration.

    The Committee member vacancy exists for one grower representative from Fresno County, the member term expires on September 30, 2022. Applicants should have an interest in agriculture and citrus pest and disease prevention.

    Individuals interested in being considered for a committee appointment should send a brief resume by March 31, 2022 to the California Department of Food and Agriculture, Citrus Pest and Disease Prevention Division, 1220 N Street, Sacramento, California 95814, Attention: David Gutierrez.

    For additional information, contact: David Gutierrez, Branch Chief, Citrus Pest and Disease Prevention Division at (916) 274-6300, or e-mail David.Gutierrez@cdfa.ca.gov.

  • Fruit World Anticipates Strong Volumes of Organic Minneolas, Blood Oranges and Cara Caras Through April

    Fruit World, a family-owned, flavor-focused grower-shipper of organic and conventional citrus and more, is reporting a strong season for their premium specialty citrus, including organic Minneola tangelos, Blood oranges and Cara Cara oranges. While California growers are experiencing shortened seasons of navel and mandarin oranges, Fruit World expects a gap-free and strong transition to Valencia season.

    “Between last year’s heavy crop and early summer heat, the state has lower production volumes of navels and mandarins, but we’re maintaining good quantities to ship through an early season end of late-March to early-April,” said Bianca Kaprielian, Fruit World co-founder and CEO. “Ending the season early ensures high quality and exceptional color throughout. And since citrus is an alternate bearing crop, we predict a return to steady volumes next season.”

    Fruit World expects a seamless transition from navels to Valencias by mid-April. The company anticipates consistent volumes of the summer variety, especially as the season ramps up in May, with availability through the beginning of October.

    “We’re also seeing impressive volumes of quality fruit for our specialty citrus varieties, and expect to be shipping into April,” Kaprielian continued. “The overall quality is top notch, and supply is strong for our Minneolas, Blood oranges and Cara Caras, with peak flavor expected from now through the end of the season.”

    This is also shaping up to be a banner year for organic lemons from both the Desert (District 3) and Central Valley (District 1) regions, with load volumes available weekly and excellent ad opportunities into May.

    “Our emphasis on flavor and fun, bold packaging is paying off for our customers, and consumers are asking for the Fruit World brand,” added Kaprielian, “Our statewide growing regions provide us with year-round supply of lemons and orange varieties. In addition to coolers in the desert and Fillmore, we offer consolidated pickup—including desert production—at our cooler in Reedley. This gives our retail and wholesale partners the benefit of a convenient and consistent loading location for all products throughout the year.”

    Fruit World commemorated the Lunar New Year in February with ½ bushel, 10-pound cartons and 4-pound clamshells of stem-and-leaf mandarins in their new Lucky Tiger label. “Beyond Lunar New Year in early February, the stem-and-leaf mandarins are maintaining appeal,” noted CJ Buxman, co-founder of Fruit World and organic citrus grower. “Our stem-and-leaf production increases every year as consumers have confidence the fresh leaves are indicative of recent harvest and the freshest fruit. We’re one of the few companies offering organic stem-and-leaf mandarins as well, which are available to our partners upon request.”

    For more information or to place an order, call (559) 650-0334 or visit fruitworldco.com.

    About Fruit World:
    Fruit World is a fresh and creative produce company with generations of history. Fruit World grows and ships the most flavorful fruit in California—including organic and conventional citrus, organic grapes, organic stone fruit, and more—and works with customers who share a passion for quality and taste. They’re all about honoring their growers, staying true to their farming heritage, and keeping family farming thriving into future generations. Visit fruitworldco.com or find them on social media at linkedin.com/company/fruitworld, instagram.com/fruitworldco, and facebook.com/fruitworldcompany.