Below you'll find a list of all posts that have been categorized as “HLB Management”
By Lauren Fessler Mathews, Ana Redondo and Ozgur Batuman The positive impact of oxytetracycline (OTC) trunk injections for citrus production in HLB-infected trees has been well established. Additionally, there has been extensive work showing that plant defense inducers (PDIs) can help boost tree health and reduce symptom development from a variety of pathogens. Based on this, University of Florida Institute …
A recent University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) article addressed the use of plant defense inducers (PDIs) as sustainable alternatives to oxytetracycline (OTC) injection for HLB management. Researchers Lauren Fessler Mathews, Ana Redondo and Ozgur Batuman at the Southwest Florida Research and Education Center (SWFREC) authored the article. Slightly edited excerpts of the article follow: PDIs …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) highlighted huanglongbing (HLB) disease in the citrus section of its recent Plant Protection and Quarantine (PPQ) 2025 Annual Report. It recognized HLB as the most serious disease of citrus, currently impacting Florida and Texas and threatening citrus in Alabama, Arizona, California, Georgia, Louisiana and Mississippi. The report …
By Tripti Vashisth, Meryam Manzoor and Johann Hiller Fruit quality and yield remain major concerns for sweet orange growers in the HLB era. Both are closely linked to the tree’s ability to support developing fruit throughout the season. Leaves are the primary source of carbohydrates needed for fruit growth, retention and juice development. Canopy density and leaf area directly influence …
Silvec Biologics Inc. has announced that its RNA-based therapy-delivery product is registered for unconditional commercial use under the U.S. Environmental Protection Agency’s (EPA) Federal Insecticide, Fungicide and Rodenticide Act. The product is registered under the name Construct CTV-SoD2. “A new tool is now available to help strengthen citrus tree health and support the future of Florida’s citrus industry,” said Matt Joyner, executive vice …
The Citrus Research and Field Trial (CRAFT) Foundation has announced that applications are now open for Traditional New Plantings Cycle Eight and Existing Tree Therapies (ETT) Round Five. TRADITIONAL NEW PLANTINGS This program evaluates grower-selected rootstock and scion combinations under commercial growing conditions. EXISTING TREE THERAPIES This program evaluates therapeutic treatments designed to improve the health and productivity of mature …
The California Department of Food and Agriculture (CDFA) has expanded the huanglongbing (HLB) quarantine boundary in San Diego County following the confirmation of one HLB-positive residential citrus tree in Fallbrook. CDFA is also expanding the Asian Citrus Psyllid (ACP) Bulk Citrus Regional Quarantine Zone 6 to reflect the HLB quarantine boundary expansion. A map of the expanded boundary can be …
Citrus greening disease continues to loom over the cold-hardy citrus region. While the industry expands in South Georgia and North Florida, the threat of the disease (also known as huanglongbing, or HLB) remains a focal point of citrus meetings, including on July 28 at the Southeast Georgia Citrus Update in Lyons. Jonathan Oliver, University of Georgia (UGA) assistant professor and …
Representatives from Fundecitrus participated in a recent roundtable discussion about the challenges of combating citrus greening. The roundtable was part of the 44th São Paulo Congress of Phytopathology in Brazil. Participants included Fundecitrus researcher Renato Bassanezi, Technology Transfer Manager Ivaldo Sala and board member Luiz Fernando Girotto, who is an agricultural director at a citrus company. The participants discussed an …
Researchers are studying why some citrus species appear to handle huanglongbing (HLB) better than others. Understanding these differences could help breeders develop more resilient citrus varieties and rootstocks for future production. A new study compared nine citrus species infected with HLB and identified differences in how the plants respond to the disease, including changes in nutrient levels, stress responses and …
A new research platform may help scientists identify potential treatments for citrus greening disease faster, potentially speeding up the search for solutions. Citrus greening, also known as huanglongbing (HLB), is caused by the bacterium Candidatus Liberibacter asiaticus (CLas). The disease disrupts the tree’s ability to transport nutrients, leading to symptoms such as blotchy leaves, small and misshapen fruit, poor juice …
Huanglongbing (HLB) has already taken a heavy toll on U.S. citrus production, but growers in Texas’ Lower Rio Grande Valley face an additional and compounding challenge — a persistent drought. Current irrigation practices relying on the Rio Grande River as the sole source of water are no longer sufficient to meet the year-round water needs of citrus trees. That is …
Following the discovery of non-commercial citrus plants resistant to greening disease, Fundecitrus researchers in the field of biotechnology have been working to understand the mechanisms underlying this resistance. The Brazilian scientists also seek to identify viable pathways for transferring these traits to commercial varieties. In 2019, hypotheses were confirmed showing that certain citrus species native to Oceania, such as Eremocitrus …
California Citrus Research and Field Trials (CA-CRaFT) plans in Ventura County call for expanded activities and a stronger emphasis on biological control of the HLB-spreading Asian citrus psyllid (ACP) with the parasitic wasp Tamarixia radiata. In a June 23 virtual presentation, Citrus Research Board integrated pest management entomologist Ivan Milosavljevic reported that the Ventura County program will utilize self-release T. …
Growers received welcomed news in June when trunk-injection therapy of oxytetracycline (OTC) was cleared for continued applications next season. Some growers have said the treatment has helped save groves from loss due to HLB. Ute Albrecht, University of Florida Institute of Food and Agricultural Sciences associate professor, has been one of the lead researchers on OTC applications and its effectiveness. …
The recent Florida Citrus Industry Annual Conference featured seminars from several scientists who are working on solutions to fight huanglongbing (HLB) disease. GENETIC RESEARCH Vivian Irish of Yale University presented her research on combating HLB through gene editing. She noted several promising gene-editing targets have been identified. Plans call for getting these lines planted to evaluate their resistance to HLB. …
Compost-amended plots (left) had more weeds than those with no compost. A new study published in Scientific Reports examines whether repeated compost applications could improve the health and productivity of young citrus trees growing under endemic huanglongbing (HLB) conditions in Florida. Gabriel Pugina, Caroline Tardivo, Brittney Monus, Emma Dawson, Sarah Strauss and Ute Albrecht of the University of Florida Institute …
Brazil’s Fundecitrus has launched an awareness campaign — The Fruit of the Orange Tree Is the Progress — to reinforce the need for unity in combating citrus greening disease. The campaign aims to show that orange production extends beyond orchards and the juice industry. Present in hundreds of municipalities, citrus farming drives regional economies, creates direct and indirect jobs, boosts …
TJ BioTech LLC has announced that, as of June 11, 2026, ReMedium TI has received a full Section 3 label and registration from the U.S. Environmental Protection Agency, along with state approval from the Florida Department of Agriculture and Consumer Services. The approved label allows for two consecutive years of treatment, starting with the 2026–27 season, followed by a one-year …
By Ute Albrecht, Larissa Nunes and Igor Silva Trunk injection of oxytetracycline (OTC) requires drilling a hole into the trunk and injecting a foreign substance into the tree. Not only does the physical damage from drilling cause injury, but the application of chemicals can exacerbate both the external and internal damage. BARK CRACKING Externally, aside from the drill hole, bark …
