Below you'll find a list of all posts that have been categorized as “HLB Management”
Sponsored Content ReMedium TI® was introduced to the Florida market in January 2023. Since its introduction, citrus producers have experienced a steady recovery from citrus greening disease, also known as huanglongbing (HLB), one of the most significant challenges facing the Florida citrus industry. Across Florida, growers are reporting renewed optimism about the potential for recovery and future growth of the …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) announced Oct. 1 that it was expanding the citrus greening (also known as huanglongbing or HLB) quarantined area in California. APHIS is adding 155 square miles to the quarantined Murrieta area of Riverside and San Diego counties. This expansion impacts 125.6 acres of commercial citrus. The agency expanded …
Sponsored Content In the ongoing battle against citrus greening (also known as huanglongbing or HLB), a disease that has devastated Florida’s citrus industry, the trunk-injection product ReMedium TI® has demonstrated promising performance. Since its commercial release in January 2022, ReMedium TI® has continued to generate interest and optimism among Florida citrus growers seeking economically viable tools to manage the disease. Recent research …
By Prudhvi Vulchi, Amit Levy and Tripti Vashisth A three-year commercial grove study evaluated plant growth regulators (PGRs) and oxytetracycline (OTC) in HLB-affected Valencia trees. The results suggest that these practices help HLB-affected trees by two distinct mechanisms. PGRs mainly supported tree growth and productivity by reducing callose accumulation and improving growth-promoting hormone levels in leaves. OTC reduced Candidatus Liberibacter …
By Christopher Vincent and Rashmi Kumari Florida summers come with intense sunlight, high temperatures and frequent rain. Just as people use sunscreen to protect exposed skin from intense sunlight, plants can benefit from a protective coating on exposed leaf and fruit surfaces. One way to provide this protection is by spraying a kaolin clay particle film on the tree. Although …
Despite a slowdown in Brazil’s citrus greening incidence growth rate in 2026, the severity of the disease continues to climb in trees remaining in the field, according to Fundecitrus’ annual citrus disease survey. Average severity rose from 22.7% to 27% across orchards of all ages, and from 25.9% to 31% when considering only orchards currently in production. The survey also …
As oxytetracycline (OTC) trunk injection becomes an important tool for managing HLB, researchers are looking for ways to make the labor-intensive treatment faster, more efficient and less expensive. Part of a research paper published in Tropical Plant Pathology discusses an automated trunk-injection system being developed for HLB-affected citrus. The authors of the paper, titled “Integrated pest management strategies to address …
Effective immediately, the U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) announced it was expanding the HLB quarantined area in California. The action was made on Sept. 1 in cooperation with the California Department of Food and Agriculture (CDFA). APHIS is adding 1 square mile to the Santa Paula quarantined area in Ventura County, which impacts 151.7 …
The development of citrus varieties that can resist HLB could eventually change how growers manage the disease. However, a recent study suggests the transition may not be as simple as planting resistant trees and stopping control of the Asian citrus psyllid (ACP) that spreads HLB. A paper about the research, published in the April 2026 issue of Agricultural Systems, examines …
The 2026 citrus disease incidence survey conducted by Fundecitrus shows that greening affected 48.08% of orange trees in Brazil’s Citrus Belt spanning São Paulo and the Triângulo/Southwest Minas Gerais regions. This is a 0.9% increase compared to 2025, when the incidence rate was 47.63%. The rise was just 0.45% — significantly lower than the 3.28% increase recorded in 2025. This …
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 …
