Origin of Oranges Can Be Determined

Josh McGillInternational

A Citrus Australia study has used trace elements or isotopes to determine if an orange originated in Australia as opposed to another country. Using the same techniques, researchers can differentiate place of origin of Australian oranges into one of the five Australian growing regions. The first-of-its-kind study was conducted through an Agriculture Victoria Food to Market program. Citrus Australia noted …

No Perfect Tree Spacing for Multiple Objectives

Josh McGillCalifornia Corner, planting

Looking for the perfect tree planting density to meet all of your objectives for citrus fruit quality and yield? That may not be possible, University of California Cooperative Extension’s Craig Kallsen said in a recent talk about planting density’s impact on navel orange yield and quality.  The citrus and pistachio farm advisor for Kern County gave the example of a …

Sweet New Discoveries Open Up Opportunities for Citrus Industry

Josh McGillFlavor, Research

By Xixuan Tang, Yu Wang, Fred Gmitter and Jude Grosser Citrus fruits and juices are commonly consumed worldwide due to their health benefits and flavor. However, recent trends in reducing carbohydrate intake have raised concerns from consumers about citrus products because of their relatively high levels of sugar content. This concern discourages repeat purchasing and consumption of citrus fruits and …

Reduce Pests With Natural Enemies

Josh McGillPests, Research

By Jawwad Qureshi A wide range of pests colonize citrus crops. Most of these species target tree canopies, and a few feed on the roots. Damage is either direct through feeding on the plant tissues or it can be twofold if the pest is also responsible for transmitting the pathogens of a disease or making conditions favorable for the disease …

Small Drops for Chinese Citrus Crops

Josh McGillCrop Forecast, International

Chinese production of tangerines/mandarins and grapefruit/pomelos in 2022–23 are both forecast to dip slightly from prior year levels. The forecast was issued by the U.S. Department of Agriculture Foreign Agricultural Service (USDA FAS). TANGERINES AND MANDARINSProduction of tangerines and mandarins is forecast at 26.5 million metric tons (MMT) in 2022–23, compared to 27 MMT the prior year. The forecast reflects …

Update on Japanese Citrus

Josh McGillCrop Forecast, International

The U.S. Department of Agriculture Foreign Agricultural Service (USDA FAS) recently issued forecasts for Japanese citrus production. Covered crops included the following: ORANGESJapanese 2022–23 orange production is forecast at 5,600 metric tons (MT), a decline of 2% from the previous year. Orange harvested area is projected to fall by 1.2% to 395 hectares. Orange imports are forecast at 80,000 MT …

Trialing Tree Immunizations for HLB, Xylella

Josh McGillHLB Management, International, Research

Australia’s Hort Innovation has announced an $8.7 million investment to trial tree immunizations that protect Australia’s horticulture industries against the deadly huanglongbing (HLB) and Xylella diseases (including citrus variegated chlorosis). Hort Innovation is a grower-owned, not-for-profit research and development corporation for Australia’s horticulture industry. Hort Innovation Chief Executive Brett Fifield said the investment aims to safeguard key Australian horticulture industries by …

Oranges and OJ in China: Production and Trade

Josh McGillChina, Crop Forecast, Orange Juice

Orange production in China is expected to increase in 2022–23 over the prior year, while its orange juice (OJ) production is forecast to decline. The forecast was issued by the U.S. Department of Agriculture Foreign Agricultural Service (USDAFAS). ORANGESChina’s orange production in 2022–23 is forecast to reach 7.6 million metric tons (MMT), up from 7.55 MMT the prior year. The …

Mandarin Production in Japan

Josh McGillCrop Forecast, International, Mandarins

Tangerine/mandarin production in Japan for 2022–23 is forecast at 921,000 metric tons (MT), down 3.5% compared to the prior year. Tangerines/mandarins account for a majority of Japan’s citrus production, and the Unshu is expected to be the leading mandarin variety at 722,000 MT. Non-Unshu varieties are forecast at 199,000 MT. The forecast was issued by the U.S. Department of Agriculture …

Fundecitrus Researchers Attend Citrus Congress

Josh McGillEvents, International

Researchers from Brazil’s Fundecitrus participated in the 14th International Citrus Congress held in Mersin, Turkey, Nov. 6–11. The event brought together participants from public and private research institutions, as well as the production and commercial sectors of citrus. Representatives from 28 countries participated in the congress, including the United States, South Africa, Australia, Israel and several countries in Europe. Fundecitrus …

New Finger Lime Cultivars for the Specialty Citrus Market

Josh McGillLimes, Tip of the Week, Varieties

By Manjul Dutt The finger lime is an HLB-tolerant Australian native citrus that has been gaining popularity and importance in the last few years. Finger lime has several unique fruit qualities that set it apart from conventional sweet oranges and mandarins. The primary characteristic of this fruit is the round to teardrop-shaped juice vesicles, known as “citrus caviar,” that burst …

Evaluation of Citrus × Microcitrus Hybrid Scions

Josh McGillResearch, Varieties

By Ute Albrecht, Anas Fadli and Chandrika Ramadugu Most commercially available citrus scion cultivars are highly attractive to the Asian citrus psyllid and susceptible to HLB. There are some citrus species, however, that are HLB tolerant or resistant. This may be because they are less attractive to the psyllids and/or because they restrict pathogen proliferation and therefore HLB disease development. …

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Southern Hemisphere Citrus Production to Rise

Josh McGillCrop Forecast, International

Citrus production in the Southern Hemisphere this year is expected to increase 4.85% compared to 2021, to 24.8 million tons, according to a preliminary forecast by the World Citrus Organisation (WCO). The forecast is based on information provided by industry associations in Argentina, Australia, Bolivia, Brazil, Chile, Peru, South Africa and Uruguay. A total of 13.2 million tons of citrus …

Rootstocks and Fertilization for Finger Limes

Josh McGillLimes, Nutrition, Rootstocks

Rootstock selection and fertilization are important for those considering growing finger limes in Florida. University of Florida Institute of Food and Agricultural Sciences horticulturist Tripti Vashisth addressed both of those topics in a recent virtual Finger Lime Symposium. Vashisth concluded that Volkamer lemon, UFR-5 and US-802 rootstocks appear promising for finger limes. She noted that a vigorous rootstock influences tree …

Finger Limes Introduced for Florida

Josh McGillLimes, Varieties

Two recently released University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) varieties of finger limes were introduced at a virtual Finger Lime Symposium held in March. Manjul Dutt of the UF/IFAS Citrus Research and Education Center hosted the symposium; he also introduced the new varieties. Lourdes Pérez Cordero, UF/IFAS Extension agent in Highlands County, reported on the new …

Italy Seeks Finger Lime Entry into United States

Josh McGillExport/Import, International, Limes

The government of Italy has asked the U.S. Department of Agriculture (USDA) to authorize the importation of fresh finger lime (Citrus australasica) for consumption into the United States. USDA’s Animal and Plant Health Inspection Service (APHIS) has drafted a pest risk assessment that describes potential pests associated with the commodity. APHIS shares draft pest risk assessments to determine whether stakeholders …

Bee Sweet Citrus Adding New Mandarin Facility

Josh McGillCalifornia Corner, Mandarins

Bee Sweet Citrus is expanding its packinghouse to include a state-of-the-art mandarin facility adjacent to California Highway 99 in Fowler. Construction for the company’s new facility broke ground in early 2022. The facility is expected to be fully operational during the 2022–2023 citrus season. The 213,000-square-foot building will include cold storage; holding and degreening rooms; washing, sorting and packing lines; …

Research Update: Stable Antimicrobial Peptide

Josh McGillPeptides, Research

By Hailing Jin Research on the effectiveness of a novel stable antimicrobial peptide (SAMP) identified from the Australian finger lime (Microcitrus australasica) to fight huanglongbing (HLB) continues in a multistate initiative involving 1,500 citrus trees. Although the pandemic has impacted the progress of the research, work has steadily continued and expanded.  Researchers at the University of California, Riverside and University …

Update on Finger Limes in Florida

Josh McGillLimes, Research, Varieties

The Australian finger lime has created a buzz among chefs and mixologists for its caviar-like texture and flavorful pulp. The fruit also has captured interest among growers for its seemingly high tolerance to HLB. On March 23, the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) hosted a half-day online symposium on finger limes to provide growers with …

Black Core Rot Being Studied

Josh McGillDiseases, International, Research

A new Hort Innovation project aims to shed some light on how black core rot happens in Australian groves so the citrus industry can learn how to better manage the disease. Black core rot caused by the fungus Alternaria spp. can be a problem for some citrus growers in the southern growing areas in Australia. Citrus infected with Alternaria spp. …