Millennium Block

Millennium Block Research Update

Daniel CooperIndian River, Rootstocks, Varieties

Flavia Zambon, assistant professor with the University of Florida Institute of Food and Agricultural Sciences, recently provided an update about Millennium Block research at the Indian River Research and Education Center. The block, established in 2019–20, is a large-scale, 5,500-tree trial seeking HLB-tolerant citrus varieties. Zambon says some varieties in the trial are showing strong fruit attributes without the need …

Hamlin

Donaldson: Potential Alternative to Hamlin in OJ

Daniel CooperOrange Juice, Varieties

U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS) scientists are studying the possibility of the Donaldson sweet orange replacing the HLB-ravaged Hamlin in orange juice (OJ). The scientists work at the U.S. Horticultural Research Laboratory in Fort Pierce, Florida. While assessing citrus trees with oranges that might be used for commercial OJ production, the scientists found the Donaldson tree at the …

varieties

CITRUS NURSERY SOURCE: Expanding Availability of Fresh Fruit Varieties

Daniel CooperCitrus Nursery Source, Varieties

By Peter Chaires Beginning in 2013, New Varieties Development & Management Corp. (NVDMC) worked in tandem with the University of Florida Institute of Food and Agricultural Science (UF/IFAS) Citrus Research and Education Center Plant Improvement Team (then Jude Grosser, Fred Gmitter and Bill Castle) and Florida Foundation Seed Producers Inc. to make newly identified fresh market citrus varieties available for …

HLB-tolerant varieties

HLB-Tolerant Varieties Available

Daniel CooperHLB Management, Varieties

Florida Foundation Seed Producers, Inc. (FFSP) has signed a licensing agreement with New Varieties Development and Management Corp. (NVDMC) to introduce new citrus varieties showing tolerance to HLB. The HLB-tolerant varieties covered by the agreement are: The collaboration also includes the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) and the Florida Department of Citrus. It aims to …

grapefruit

Growing More Than Grapefruit in CUPS

Daniel CooperCUPS, Varieties

Growers use the citrus under protective screen (CUPS) production system to protect trees from the Asian citrus psyllid, the insect vector of HLB disease. While grapefruit is most commonly grown in CUPS, statistics support the belief that CUPS can be conducive to other types of citrus. “There’s a need to establish the growing requirements and the needs of other varieties. …

satsuma

Georgia Citrus Grower Discusses Satsuma Situation

Daniel CooperCold Hardy, Mandarins, Varieties

Georgia’s citrus industry has found its footing more than a decade into production. Whether growers can thrive for the next 10 years may depend largely on their ability to expand production beyond satsuma mandarins. “It is a work in progress. Anybody getting into it will need to consider that,” Georgia grower Buck Paulk said. “There’s a lot of unknowns with …

citrus trees

Options for Dooryard Citrus Trees

Daniel Coopernurseries, Varieties

Citrus trees used to be a common site around Florida homes, but diseases like canker and greening have diminished residents’ ability to enjoy these iconic trees. Despite the challenges, people from Florida and across the country contact citrus nurseries this time of year, seeking to purchase trees for their yards and/or homes. It’s a passion, say nursery owners and University …

HLB-tolerant varieties

Options for Planting Profitable Citrus Varieties

Daniel CooperBreeding, Rootstocks, Varieties

By Maegan Beatty On Feb. 18, Jude Grosser and Fred Gmitter hosted an online informational session on new citrus varieties and how to plant a profitable crop in the future. Both Grosser and Gmitter are part of the citrus improvement team at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center. Their main …

top

Top Florida Citrus Varieties and Rootstocks

Daniel Coopernursery, Rootstocks, Varieties

Sour orange jumped six spots from the prior year to become the most-budded rootstock in Florida citrus nurseries in 2023–24. Rootstock US-942 had held the top spot for at least the last three years. Valencia SPB-1-14-19 easily maintained its spot as the most-budded variety clone. It has held the top spot for at least four straight years.  The number of …

new varieties

CITRUS NURSERY SOURCE: New Varieties Released

Daniel CooperCitrus Nursery Source, Varieties

By Peter Chaires On October 24, 2024, the University of Florida’s (UF) Cultivar Release Committee unanimously approved the release of seven citrus varieties to Florida Foundation Seed Producers, Inc. Florida Statutes now require that, before being released to the general public, any new variety of citrus developed as a result of any research or study accomplished using any percentage of …

survey

Survey Shows Popular Scions and Rootstocks

Daniel CooperRootstocks, Survey, Varieties

The Florida Citrus State of the Industry Survey seeks input from growers on key issues affecting their groves. The survey has been conducted for many years, has tracked the trajectory of HLB and reported on production practices. While not a scientific survey, it has reflected general trends over the years. Last month, we published results on trunk-injection therapy and the …

Sugar Belles

Sugar Belles Show Good Production in Georgia Trial

Daniel CooperGeorgia, Rootstocks, Varieties

University of Georgia (UGA) County Extension Coordinator Jake Price recently provided an update on a row of Sugar Belles planted at a Georgia research plot in 2018. The Sugar Belle planting originally had 20 trees on four different rootstocks. Each rootstock was replicated five times. The rootstocks used were US-852, US-942, US-897 and Rubidoux. “After the December 2022 freeze, the …

two

Two New Early-Season Sweet Oranges for Florida Growers

Daniel CooperTip of the Week, Varieties

By Manjul Dutt, Sheetal Ramekar and Gary England Developing new citrus cultivars, whether through conventional breeding or genetic engineering methods like transgenics or CRISPR is potentially the most viable long-term strategy to combat huanglongbing (HLB). Identifying potential survivor trees — citrus trees that exhibit disease tolerance in areas with endemic HLB — can also serve as a useful strategy for …

open house

Indian River Open House Includes Varieties Display

Daniel CooperEvents, Indian River, Varieties

The University of Florida Institute of Food and Agricultural Sciences Indian River Research and Education Center (UF/IFAS IRREC) will hold an open house Saturday, Dec. 7 from 9 a.m. to 2 p.m. Numerous activities are planned for the facility at 2199 S. Rock Road in Fort Pierce.  UF/IFAS IRREC and its next-door neighbor, the U.S. Department of Agriculture-Agricultural Research Service …

hybrid

HLB-Tolerant Hybrid Varieties Highlighted

Daniel CooperEvents, Indian River, Varieties

Two varieties that tolerate HLB and produce ample fruit yield and juice were the highlights of the recent Millennium Block Field Day in Fort Pierce, Florida. The 20-acre Millennium Block at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Indian River Research and Education Center (IRREC) examines fresh fruit varieties and rootstocks. “The two varieties that give …

maturity standards

Juice Maturity Standards Eased; Varieties Approved for Licensing

Daniel CooperFlorida Citrus Commission, Varieties

Update as of 12-2-24: For the period beginning 12:00 a.m. on Dec. 2, 2024, and ending at 11:59 p.m. on May 23, 2025, maturity standards in regard to ratio are suspended for all grapefruit including field run and eliminations. This emergency rule supersedes Emergency Rule 20ER24-4. At the request of Florida processor and grower associations, the Florida Citrus Commission (FCC) …

flame

New Flame Grapefruit Selection Offers Improved HLB Tolerance

Daniel CooperGrapefruit, Tip of the Week, Varieties

By Manjul Dutt, Sheetal Ramekar and Gary England The grapefruit was created by chance from a cross between a pummelo and a sweet orange. It was first discovered in Barbados in the 18th century. All the commercially sold grapefruits today trace their roots back to the Duncan variety of grapefruit. Cultivars existing today were developed through natural and induced mutations …

shiranui

Shiranui Gaining Popularity in Cold-Hardy Citrus Region

Daniel CooperCold Hardy, Varieties

Leaders in the cold-hardy citrus region have long advocated for growers to diversify their crop portfolios. Lindy Savelle, executive director of the Georgia Citrus Association, has wanted citrus producers in North Florida, South Georgia and South Alabama to plant alternatives to satsuma mandarins, which has been the predominant citrus type produced in the region. Diversification helps extend the harvest season. …

field day

Field Day Featured Favorable Fresh Fruit Rootstock and Scion Combinations

Daniel CooperEvents, Rootstocks, Varieties

The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Indian River Research and Education Center recently hosted a field day showcasing its Millennium Block citrus grove. The field day went on despite the grove being impacted by a tornado associated with Hurricane Milton in October. The Millennium Block is one of the largest experimental trials examining fresh fruit …

variety

New Orange Variety Introduced in China

Daniel CooperBreeding, International, Varieties

Li Ningxian, a fruit grower in China’s Jiangxi province, discovered in 2004 that some of his Nanfeng oranges matured about six weeks earlier than usual. Although he attempted to propagate these early-maturing branches, the variety proved unstable with sugar content. Ningxian sought help from YI Hualin, a professor at Huazhong Agricultural University College of Horticulture & Forestry Sciences, who specializes …