Smelling Huanglongbing for Early-Detection

Josh McGillCitrus Greening

Another early-detection method being developed works by smelling huanglongbing infections in trees. This method detects the different scents plants give off. Researchers at the University of California, Davis have created a test that could lead to advances in fighting huanglongbing (HLB) disease in citrus. Researcher and professor of mechanical and aerospace engineering, Christina Davis, said the test looks for a …


Trunk-Injection Suggestions

Daniel CooperHLB Management

University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) associate professors Ute Albrecht, Ozgur Batuman and Megan Dewdney recently wrote Suggested Use Pattern of Injectable Antimicrobials for Huanglongbing (HLB) Management (April 2024). They emphasized that the document is not an official UF/IFAS recommendation but is based on the labels for antimicrobial products ReMedium and Rectify. Some key suggestions in …


Investing in New Citrus Plantings in Brazil Can Be Worthwhile

Daniel CooperBrazil, Economics, planting

A study by Brazilian citrus consultant Gilberto Tozatti indicated that even under high HLB pressure, but with reasonable prices, it is worth investing in new citrus plantings. Tozatti’s study, presented at the recent International Research Conference on HLB, received support from the Group of Citrus Consultants (GCONCI). Tozatti summarized his presentation: Brazil is the world leader in the production of …

nutrient availability

The Effect of Soil pH on Nutrient Availability

Daniel CooperNutrition

By Chris Oswalt Soil pH influences nutrient availability. This article considers the specific fate of nitrogen, phosphorus and potassium in soils with elevated pH values. The discussion also assumes that these effects would be similar to conditions in the wetted zone where micro-sprinkler irrigation has raised soil pH. NITROGEN Soil pH can affect several reactions involving nitrogen in the soil …


Rigorous HLB Control Works at Brazilian Farm

Daniel CooperBrazil, HLB Management

Fabrício Eustáquio Lanza, research coordinator at Brazil’s Cambuhy Agricola, recently told how his company has kept HLB at low and economically acceptable incidence levels. His presentation at the recent International Research Conference on HLB was based on a report he co-authored with Alexandre Tachibana, Ivan Brandimarte, Antonio Juliano Ayres and Renato Beozzo Bassanezi. The report follows: MANAGEMENT MEASURES Huanglongbing (HLB), …


Outlook for Brazilian Acreage and Production

Daniel CooperAcreage, Brazil, Production

A study by researchers Gilberto Tozatti, Mauricio Mendez and Rodolfo Castro indicated the likely future significant reduction in Brazilian citrus acreage and production due to huanglongbing (HLB or greening). The calculations are based solely on the current Brazilian Citrus Belt and do not consider future citrus projects happening in areas outside of it. Tozatti presented the study at the recent …

breeding program

California Citrus Breeding Program Gets More Funds

Daniel CooperBreeding, California Corner

The presidents of the Citrus Research Board (CRB) and California Citrus Mutual (CCM) applauded congressional leaders for recently approving additional funds for the new citrus breeding program in Parlier, California. Congress is allocating an additional $500,000 in federal funding on top of the $1 million granted last year to expand the program into California. The program will now receive $1.5 million in …


University of Georgia Lab Offers HLB Testing

Daniel CooperGeorgia, HLB Management

The University of Georgia’s (UGA) Plant Molecular Diagnostic Laboratory (MDL) on the Tifton campus is a U.S. Department of Agriculture-certified lab performing huanglongbing (HLB, also known as citrus greening) testing. It offers the advanced test to commercial growers, homeowners, nurseries, Extension and research personnel and the Georgia Department of Agriculture. The molecular test per sample costs $80. Candidatus Liberibacter species associated with HLB …


HLB Quarantine Areas Expanded in California

Daniel CooperCalifornia Corner, HLB Management, Regulation

Federal and state agriculture officials have expanded the areas quarantined for huanglongbing (HLB; also known as citrus greening) in California. The action was taken by the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) in cooperation with the California Department of Food and Agriculture (CDFA).  APHIS is adding portions of Los Angeles, San Diego and Ventura counties …


‘The Psyllids Will Like Georgia Just Fine’

Daniel CooperGeorgia, Psyllids

A California citrus leader believes Georgia will make an ideal home for the Asian citrus psyllid, which vectors the devastating huanglongbing (HLB) disease. “North of Florida, it is colder, and it’s certainly not as suitable a place as Florida is, but the psyllid is still going to be fine. The cold isn’t long enough here to knock the populations out,” …


Growers Must Settle for HLB-Tolerant Trees While Waiting for Resistance

Daniel CooperEvents, HLB Management, Varieties

The dream of citrus varieties being totally resistant to huanglongbing (HLB) disease (citrus greening) is still a distant reality for Florida growers. For now, they must depend on tolerant varieties to lessen the disease’s impact, which is widespread throughout most of the state. Michael Rogers, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center …

Florida Citrus Growers’ Institute

Register for the 2024 Florida Citrus Growers’ Institute

Daniel CooperEvents, HLB Management, Tip of the Week

Citrus greening or huanglongbing (HLB) continues to impact all citrus production areas of Florida. The 2024 Florida Citrus Growers’ Institute is an opportunity for Florida citrus growers to come together to learn about effective management of HLB and other challenging pests and diseases affecting the industry. Topics this year include horticultural management of HLB, citrus nutrient management and management of …


HLB Could End Georgia’s Citrus Industry

Daniel CooperGeorgia, HLB Management

One California citrus leader believes Georgia should respond more aggressively to huanglongbing (HLB, also known as citrus greening) for the sake of the industry’s future in the state. Roger Smith, fourth-generation citrus producer and executive of AC Foods, spoke during the recent Georgia Citrus Association meeting in Tifton. He discussed the disease that devastated citrus production in Florida and could …


HLB Management Different for North Florida Citrus

Daniel CooperCold Hardy, HLB Management

Living with huanglongbing (HLB) disease (citrus greening) is a much different process for citrus growers than protecting their crop from it. Growers in the cold-hardy citrus region are currently trying to keep the devastating disease out of their area. Industry experts like Michael Rogers, University of Florida Institute of Food and Agricultural Sciences Citrus Research and Education Center director, are …

Citrus Health Forum

Citrus Health Forum Helps Cold-Hardy Growers

Daniel CooperCold Hardy

Production in the cold-hardy citrus region is still in its infancy. Growers and industry leaders need events like the Citrus Health Forum to obtain the necessary information to help this young industry continue to flourish. The latest forum took place at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) North Florida Research and Education Center in Quincy …

cycle 2

California’s CRaFT Accepting Cycle 2 Applications

Daniel CooperCalifornia Corner, Psyllids

California’s Citrus Research and Field Trials (CA-CRaFT) program is now accepting Cycle 2 applications from commercial growers. This initiative aims to showcase the efficacy of additional control measures against the Asian citrus psyllid (ACP). ACP is the carrier of the Candidatus Liberibacter asiaticus bacterium causing huanglongbing (HLB) disease in citrus. For Cycle 2, applications will be accepted until program capacity …

citrus greening

New Light Shed on HLB and Fertilization

Tacy CalliesHLB Management, Nutrition

The effort to help huanglongbing (HLB)-impacted citrus trees has taken another step forward. A University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) study examined the relationship between fertilization, root health and fruit yield. Researchers focused on Valencia orange trees with HLB. Associate Professor Davie Kadyampakeni led the effort at the UF/IFAS Citrus Research and Education Center. The study, …

Irrigation Strategy to Enhance Fruit Growth and Retention

Tacy CalliesIrrigation, Tip of the Week

By Tripti Vashisth  Huanglongbing (HLB) severity is associated with small fruit sizes and lower fruit numbers at harvest. Moreover, small fruit are more likely to drop and drop earlier during preharvest fruit drop. Unfortunately, management practices suggested to increase fruit size or reduce drop have had mixed results. So, before looking for ways to increase fruit size and number, it …

Louisiana HLB Quarantine Area Expanded

Tacy CalliesDiseases, Louisiana, Regulation

Federal agriculture officials, in cooperation with Louisiana agriculture officials, have established a federal quarantine area for huanglongbing (HLB; citrus greening), caused by Candidatus Liberibacter asiaticus, in all of Saint Charles Parish in Louisiana. The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (USDA APHIS) took the action in cooperation with the Louisiana Department of Agriculture and Forestry (LDAF). …

How Mexico Has Dealt With HLB

Tacy CalliesHLB Management, Mexico

Mexico’s Ministry of Agriculture and Rural Development recently pointed out ways the country has successfully dealt with huanglongbing (HLB), the most devastating disease of citrus worldwide. The ministry reported that the disease has triggered socioeconomic problems in other citrus-producing countries and regions in the Americas, Africa and Asia. “With appropriate agronomic-phytosanitary management, the life of affected trees can be prolonged, …