Below you'll see everything we could locate for your search of “HLB”
Controlled-release fertilizers (CRFs) may help improve leaf nutrition in citrus trees affected by huanglongbing (HLB), but choosing the right fertilizer program is critical to maintaining yields, according to new research. A University of Florida Institute of Food and Agricultural Sciences study compared two CRF programs with a conventional fertilizer program in mature Valencia sweet orange trees growing in Florida’s sandy …
A new study suggests that tackling both the bacterium responsible for huanglongbing (HLB) and the tree’s own response to infection may offer a better path for managing the disease. A report on the research — “Combating citrus greening disease by simultaneously targeting the pathogen and callose-mediated phloem occlusion” — examines how the disease disrupts the movement of sugars through citrus …
In 2025, high school student Tanishka Aglave regaled the Highlands County Citrus Growers Association (HCCGA) annual meeting with a discussion of her prize-winning investigation into a natural alternative treatment for HLB. Instead of using the standard HLB treatment oxytetracycline (OTC) as a trunk injection, she injected HLB-infected trees with an extract from the Indian curry leaf plant. She reported that …
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 …
By Noor Ul Basar, Muhammad Adnan Shahid, Duplicate Sambani and Davie M. Kadyampakeni Huanglongbing (HLB) remains the greatest challenge facing citrus production in Florida. While there is currently no cure for HLB, effective management of affected trees remains a primary focus for Florida citrus growers. Efficient nutrient management is an important strategy for maintaining the health and productivity of HLB-affected …
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 …
California Department of Food and Agriculture (CDFA) and U.S. Department of Agriculture (USDA) officials have confirmed the detection of HLB in one tree in a residential property in the city of Calexico, Imperial County, California. This is the first HLB detection in a tree in Imperial County. In November 2025, an Asian citrus psyllid (ACP) was confirmed positive in Imperial …
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 …
As citrus growers continue searching for varieties that can perform under huanglongbing (HLB) pressure, researchers are looking beyond tree survival. Fruit quality, flavor and consumer acceptance are becoming increasingly important parts of the equation. A new study evaluated several HLB-tolerant mandarin hybrids and identified selections that combine disease tolerance with traits that could make them attractive for fresh-market production. An …
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 …
Recent research provides one of the clearest pictures to date of how huanglongbing (HLB) disease develops over time and affects different parts of a tree. An article about the research — “Microscopic Atlas of Citrus Huanglongbing Unravels Its Sequential Disease Development Mechanism” — was published in the journal Phytopathology. The authors are researchers Diann Achor, Camila Ribeiro, Jinyun Li and …
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 …
A newly published study suggests that the use of individual protective covers (IPCs) followed by monthly applications of homobrassinolide (HBr) after IPCs are removed is beneficial. The two-step approach can help young mandarin trees stay healthier longer and produce more fruit in Florida’s HLB-endemic environment. The study, “Combining Individual Protective Covers and Homobrassinolide Treatment Prolongs Tree Health and Increases Fruit …
By Flavia Tabay Zambon and Paulo Eduardo Branco Paiva Florida’s citrus industry has faced severe decline due to huanglongbing (HLB, also known as citrus greening). Production has dropped 92% since the 2003–04 season, according to the U.S. Department of Agriculture Economic Research Service. Growers have relied on cultural practices, tolerant varieties and antimicrobial treatments, especially oxytetracycline (OTC), which has recently …
