Touring Trials at the Whitmore Farm Field Day

Jim Rogers Events, Rootstocks, Varieties

The A.H. Whitmore Foundation Farm near Groveland, Florida, recently hosted a field day. The event was presented by the U.S. Department of Agriculture (USDA), New Varieties Development and Management Corporation (NVDMC) and the Florida Citrus Research Foundation. The farm opened in 1959. The 400-acre property includes 110 acres of groves on prime citrus land. Some of the state’s most popular …

Growers and Researcher Discuss Millennium Block Trials

Jim Rogers Research, Rootstocks, Varieties

Two citrus growers recently explained the benefits to be gained from research at the Indian River Research and Education Center’s (IRREC) Millennium Block in Fort Pierce, and a scientist discussed a grapefruit study there. The IRREC is a University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) facility. The 20-acre block was planted in 2019 to help growers find …

Millennium Block Field Day Gives Growers Firsthand Look at Trials

Jim Rogers Events, Rootstocks, Varieties

The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Indian River Research and Education Center (IRREC) in Fort Pierce hosted a drive-through field day for attendees to tour its Millennium block. The grove features more than 5,500 2- and 3-year-old trees. A total of 154 new citrus scion/rootstock combinations are included in the research project. The trial has …

HLB Tolerance Data Expected in Early 2023

Jim Rogers Rootstocks, Varieties

Conclusive data on trials in the Millennium Block, expected in early 2023, may reveal which of more than 5,500 trees can tolerate HLB, researchers say. The Millennium Block is at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Indian River Research and Education Center (IRREC) in Fort Pierce. IRREC Director Ronald Cave said the 20-acre grove, established …

Citrus Growers Invited to Visit Variety Trial

Jim Rogers Events, Rootstocks, Varieties

The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Indian River Research and Education Center (IRREC) will host a Millennium Block Variety Trial Field Day on Oct. 19. The event will be held from 9 a.m. to noon. The Millennium Block is at 7850 Pruitt Research Road in Fort Pierce. Registration can be completed online here or by …

Stay Current With Research on Rootstocks

Jim Rogers Rootstocks, Tip of the Week

By Jude Grosser The ultimate solution to the HLB problem is having good rootstocks that can mitigate or eliminate the disease’s impacts in any grafted commercial scion. With this, growers could profitably grow any scion, including grapefruit, Hamlin or even Murcott. Thus, rootstock breeding efforts focus on directly screening new rootstock hybrids for their ability to confer HLB tolerance or …

Chinese Rootstocks Show Promise in Australia

Jim Rogers International, Research, Rootstocks

Preliminary data from an Australian research project suggest Chinese rootstocks No. 24 and 85-24 are having a dwarfing effect on citrus tree growth and will be candidates for future high-density cropping systems. Citrus Australia reported that those rootstocks have strong potential in heavy soils, and that results on deep sandy loam soil are also very encouraging. Tahir Khurshid from the …

Progress in Developing Improved Citrus Rootstocks to Mitigate HLB

Jim Rogers HLB Management, Research, Rootstocks

By Jude Grosser, Manjul Dutt and Fred Gmitter Exploiting citrus genetic diversity is the key to defeating HLB. Plant species have survived for millennia with evolving, hostile pathogens. This is possible through natural selection within genetically diverse populations. Tolerant or resistant individuals survive and intermate, get through the bottleneck, and the species evolves. Current citriculture is based on extremely limited …

Sneak Peek: July 2022 Citrus Industry

Jim Rogers Rootstocks, Sneak Peek, Varieties

HLB continued to contribute to reduced production and lower quality fruit for Florida growers this season. University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) researchers are working to help alleviate these problems by delivering improved rootstocks and varieties. The July issue of Citrus Industry magazine includes an in-depth look at this work. Read “Juice for Florida’s future” to …

Releasing Rootstocks: Balancing Responsibility With Urgency

Jim Rogers Rootstocks, Tip of the Week

By Bill Castle, Fred Gmitter and Jude Grosser The rootstock development cycle, from creation to eight years in the field to release, is presently about 10 to 15 years. However, if multiple trials are involved, then the time required is increased. The criteria used to advance new selections through the system are commercially based. Rootstocks for juice fruit are assessed …

Rootstocks and Fertilization for Finger Limes

Jim Rogers Limes, 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 …

Progress With SuperSour Rootstock Trials

Jim Rogers Research, Rootstocks

By Kim D. Bowman The breeding of new citrus rootstocks is not an endeavor for the impatient. Two of the most popular rootstocks in Florida, US-942 and US-812, each were included in field evaluation for more than 20 years before the U.S. Department of Agriculture (USDA) released them for commercial use. In these cases, the time invested in thorough testing …

Australia Evaluating Dwarfing Rootstocks

Jim Rogers International, Research, Rootstocks

Tahir Khurshid of Australia’s New South Wales Department of Primary Industries (NSW DPI) is leading a project evaluating several overseas rootstocks budded to a range of mandarin and sweet orange varieties. One of the components is evaluating the rootstocks for their dwarfing effect, which will potentially produce small trees for high-density planting systems for the citrus industry.   Size-controlling rootstocks have …

CRDF Seeks Growers for Rootstock Trials

Jim Rogers CRDF, Rootstocks

The Citrus Research and Development Foundation (CRDF) is seeking Florida citrus growers on the Ridge and in the flatwoods of Southwest Florida to potentially be grower-cooperators in large rootstock trials. The goal of the new trials is to identify plant material with the traits needed by growers to realize the highest possible pound solids per acre and increase tree viability …

Consistency Is Key in Rootstock Field Trials

Jim Rogers Rootstocks, Tip of the Week

By Bill Castle Today, at least three things seem to be true about Florida citrus rootstock field trials: There is an unprecedented number of them underway or soon to be planted. The sponsors are many, including the University of Florida, U.S. Department of Agriculture, Citrus Research and Development Foundation, Citrus Research and Field Trial Foundation and the Multi-Agency Coordination Group. …

Achieving Successful Nursery-Grower-Researcher Partnerships

Jim Rogers Research, Rootstocks, Tip of the Week

By Bill Castle, Fred Gmitter and Jude Grosser The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center (CREC) plant improvement team has long been engaged in field research to evaluate new scions and rootstocks. That effort continues and has involved trials on public and private property. While public sites are valuable, they are …

citrus rootstock

Florida’s Top Rootstocks and Varieties

Ernie Neff Rootstocks, Varieties

US-942 remained the top citrus rootstock in Florida for the third year in a row, and Valencia SPB-1-14-19 was the top variety. ROOTSTOCKSMore than 1.28 million nursery trees were budded on US-942, according to the Florida Department of Agriculture and Consumer Services’ (FDACS) Citrus Budwood Annual Report for 2020-21. The next 14 most popular rootstocks, with the number of buddings, …

Which Rootstock to Select

Tacy Callies Rootstocks, Tip of the Week

Valencia trees on high-vigor (left) and low-vigor (right) inducing rootstocks in a Central Ridge field trial. Note the higher yield efficiency of the smaller trees on the right and the leaning of these trees due to Hurricane Irma. By Ute Albrecht Rootstock selection is critical for longevity and productivity of a grove. The decision should be based on compatibility with …

Early Performance of Orange Rootstocks in Commercial Settings

Tacy Callies Economics, Rootstocks

By Ariel Singerman, Stephen H. Futch and Brandon Page This article provides estimates on the performance of different rootstocks grafted with Valencia sweet orange scions in commercial field conditions. These are the first estimates obtained from side-by-side trials that compare the performance of rootstocks developed by two breeding programs: The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) …

Graft Compatibility of New Scion−Rootstock Combinations

Tacy Callies Rootstocks

By Ute Albrecht, Bo Meyering, José Chaparro and Kim D. Bowman Grafting is an ancient horticultural technique. There is evidence of citrus grafting in the Roman era dating back to the fifth century. In western Europe, grafting was regularly practiced in the 16th and 17th centuries when citrus was grown as an exotic ornamental in containers in orangeries. In Florida, …