Angle Calls for Faster Research Progress on HLB

Josh McGill Events, HLB Management

Scott Angle, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) senior vice president for agriculture and natural resources, began the educational session during the Florida Citrus Industry Annual Conference with a message of urgency. He recognized the critical threat posed by HLB and said science could catch up to the problem. “Plant sciences are advancing globally at almost …

Build Resilience in HLB-Affected Hamlin Trees

Josh McGill HLB Management, Tip of the Week

By Taylor Livingston and Tripti Vashisth Fighting HLB alongside weather disasters like freezes and hurricanes is leaving growers with little options for sustaining yields. The Hamlin sweet orange variety is known for higher susceptibility to HLB symptoms which cause rapid tree decline, including increased pre-harvest fruit drop and canopy loss. Production strategies that target fruit drop and canopy health improvement …

HLB Researcher Honored

Josh McGill Awards, Brazil

Fundecitrus researcher Marcelo Pedreira de Miranda has received the Outstanding Citriculture Engineer-Agronomist Award from the 48th Expocitrus and 44th Citriculture Week. The Brazilian entomologist, whose main studies are related to HLB, has worked at Fundecitrus since 2008. The award ceremony where Miranda was honored was part of the opening afternoon of the exhibition week and was attended by authorities and …

Antibiotics, HLB and Psyllids

Josh McGill HLB Management, Pests

Entomologist Kirsten Pelz-Stelinski recently shared findings from trials on the use of foliar-applied and trunk-injected antibiotics for controlling HLB and the Asian citrus psyllids (ACP) that spread the disease. Pelz-Stelinski is associate center director at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center (CREC) in Lake Alfred.  In a May 17 presentation …

HLB in Florida Is a Warning to California

Josh McGill California Corner, HLB Management

The damage that HLB has inflicted on Florida citrus groves and production over the past 18 years should serve as a warning for California producers, California’s Citrus Pest & Disease Prevention Program (CPDPP) stated recently. CPDPP noted that with HLB detected in thousands of California residential trees, it’s important for commercial growers to take steps to prevent the disease. According …

Repurposing Tools to Tackle HLB

Josh McGill HLB Management

By J. Scott Angle, jangle@ufl.edu, @IFAS_VP The hurricane-battered harvest numbers don’t show it, but we’re in a much better place in developing scientific solutions for managing HLB than we were a year ago. That’s because our scientists have discovered that tools invented to solve other problems can help address your one big problem. GIBBERELLIC ACIDFor example, gibberellic acid (GA) has …

Awareness Campaign Battles HLB in Brazil

Josh McGill Brazil, HLB Management

Brazil’s Fundecitrus in 2022 and 2023 conducted an awareness campaign to replace citrus and myrtle plants to combat HLB in the municipality of Itobi, São Paulo. The citrus and myrtle plants were replaced with other fruit and ornamental species that do not host the Asian citrus psyllid that transmits HLB, also known as greening disease. These citrus and myrtle plants …

Native Lime Might Keep HLB Out of Australia

Josh McGill HLB Management, International, Limes

A comprehensive map of the genome of an Australian native lime species that is resistant to HLB could be the key to preventing the disease from entering Australia. Researchers from The University of Queensland (UQ) in Australia have sequenced the genome of the Australian round lime, also known as the Gympie lime. They are now looking at five other native …

Project Seeks Quick HLB Diagnostic Tests

Josh McGill HLB Management, International, Research

Canadian college Seneca, in partnership with Ottawa-based Evik Diagnostic Innovations Inc., is working to develop a quick diagnostic test for the citrus disease HLB. Frank Merante, professor in Seneca’s School of Biological Sciences & Applied Chemistry, is the principal investigator for the project. The idea behind the research was to develop a simple way for growers to test crops and identify the …

Update on HLB-Tolerant/Resistant Tree Programs

Josh McGill Florida Department of Citrus, HLB Management, Varieties

The Florida Citrus Commission (FCC) in March heard updates on programs intended to provide growers with HLB-tolerant or -resistant trees and on other Florida Department of Citrus (FDOC) scientific research programs. Director of Scientific Research Rosa Walsh provided the updates. The FCC serves as the FDOC’s governing board. Walsh announced that for the FDOC’s Program for Expedited Propagation, all materials …

Lessons Learned From HLB as an Immune-Mediated Plant Disease

Josh McGill HLB Management, Research

By Nian Wang How the huanglongbing (HLB) pathogen Candidatus Liberibacter asiaticus (CLas) causes damage to infected citrus trees has been widely debated. A recent study demonstrates that HLB is an immune-mediated plant disease (Ma et al., 2022). It was discovered that CLas infection of citrus stimulates systemic and chronic immune response in phloem tissues, including reactive oxygen species (ROS) production, …

Deficit Irrigation in HLB-affected Citrus Trees

Josh McGill Irrigation, Research

By Davie Kadyampakeni, Samuel Kwakye, Hossein Ghoveisi, Lauren Diepenbrock and Jawwad Qureshi Deficit irrigation practices can reduce water and energy costs, thus potentially increasing water-use efficiency and water savings in citrus production. Irrigation management through deficit applications, if timed at periods of reduced water demand, could help trigger increased root water and nutrient uptake while synchronizing citrus flush patterns. These …

Uruguay Has First HLB Detections

Josh McGill HLB Management, International

The first cases of plants with HLB disease have been confirmed in Uruguay, according to a health emergency note released by the country’s Ministry of Livestock, Agriculture and Fisheries. Plants with symptoms were found in a residence in the city of Bella Unión. After laboratory analysis, the presence of the disease was confirmed. Inspections were carried out in the homes …

CRDF Funds Project to Arrest HLB Bacteria

Josh McGill CRDF, Research

At the latest Citrus Research and Development Foundation (CRDF) board of directors meeting, funding was approved for a project by Robert Turgeon. He is a professor of plant biology at Cornell University. “Dr. Turgeon is considered by some to be the world’s foremost expert on phloem physiology. If his project succeeds, it could solve our problem with HLB,” CRDF chief …

HLB Concerns Government Officials in Brazil

Josh McGill Brazil, HLB Management

Brazil’s Fundecitrus on Feb. 15 participated in a meeting with state and local government representatives to discuss the country’s citrus greening (HLB) situation. Representatives of the Department of Agriculture and Supply (SAA) of the state of São Paulo and mayors of some municipalities in the citrus belt also attended. Mayors and representatives of city halls expressed concern about the economic …

citrus greening

Why There Is a Lack of HLB in Georgia

Josh McGill Georgia, HLB Management

HLB has yet to become a major problem for Georgia’s citrus producers. Jonathan Oliver, University of Georgia assistant professor and small fruits pathologist, attributes the disease’s lack of presence in Georgia’s commercial groves to multiple factors. “It still comes down to the fact that, number one, you don’t see symptoms for a while. A lot of our trees are young,” …

Rectify Injection Available for HLB in Florida

Josh McGill HLB Management, Industry News Release, Pesticides

Rectify, AgroSource, Inc.’s 95% oxytetracycline hydrochloride-based tree-injection product, is expected to be available for use against HLB in Florida citrus as early as Feb. 24. The product will be available to growers through existing commercial agricultural product distributors. AgroSource petitioned and received a Special Local Needs (SLN) approval for Rectify by the Florida Department of Agriculture and Consumer Services (FDACS) …

First HLB Confirmation in City of San Diego

Josh McGill California Corner, HLB Management, Regulation

The citrus disease HLB has been confirmed for the first time in the city of San Diego, California, making it the second city in San Diego County with a positive detection. (Read about the first San Diego County detection here.) The new detection was made in a residential citrus tree located in the Rancho Bernardo area of the city. The …

citrus

OLL Sweet Oranges Producing Pre-HLB Fruit Quality

Josh McGill Tip of the Week, Varieties

By Jude Grosser, Fred Gmitter and Maria Brenelli The new OLL (Orie and Louise Lee) series of sweet oranges (OLL-4, OLL-8 and OLL-20) are very high-quality processing sweet oranges that generally produce higher soluble solids and better juice color than Valencia. OLL trees are more vigorous than Valencia, and anecdotal evidence suggests they are slightly more HLB-tolerant than Valencia. Trees …

Trialing Tree Immunizations for HLB, Xylella

Josh McGill HLB Management, International, Research

Australia’s Hort Innovation has announced an $8.7 million investment to trial tree immunizations that protect Australia’s horticulture industries against the deadly huanglongbing (HLB) and Xylella diseases (including citrus variegated chlorosis). Hort Innovation is a grower-owned, not-for-profit research and development corporation for Australia’s horticulture industry. Hort Innovation Chief Executive Brett Fifield said the investment aims to safeguard key Australian horticulture industries by …