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Below you'll find a list of all posts that have been categorized as “HLB Management”
A wealth of observations are being recorded by growers and scientists on the effects of trunk injection of oxytetracycline (OTC). Visually, trees have responded with better canopies. Hopefully, higher yields and quality will continue to follow the applications. But what about below ground? There have been recorded improvements in citrus root mass in treated trees. Sarah Strauss, associate professor of …
Fundecitrus recently announced two efforts aimed at assisting Brazilian growers with citrus greening. A São Paulo task force will include a focus on the disease, and a credit line will be available for growers with greening in their orchards. In addition to greening, the public/private task force will address development of biofertilizer and biological research, studies to increase productivity in …
Few would dispute that the approval of oxytetracycline (OTC) for use as a trunk-injection therapy to treat HLB is one of the biggest breakthroughs in the nearly two decades of fighting the disease. Most Florida citrus growers believe the therapy has been a net positive and they are committed to continuing the treatment. However, there’s a stipulation in the labels …
The incidence of citrus greening disease (HLB) in Brazil’s Citrus Belt of São Paulo and Triângulo/Southwest Mineiro rose from 24.42% in 2022 to 38.06% in 2023, according to Fundecitrus. The association’s annual survey indicates the disease increasingly demands more effective and collaborative measures. At a session of Brazil’s Expocitrus in June, Fundecitrus researcher Marcelo Miranda discussed the development of greening …
In the fall of 2022, five University of Florida researchers investigated Florida residents’ attitudes on HLB and Asian citrus psyllids (ACP) using online surveys over a 9-month period. The results of the study, Residents’ contribution to Asian citrus psyllid and citrus greening management in Florida residential habitats, was recently published in the Journal of Integrated Pest Management. Authors Romain Exilien, …
Tanishka Balaji Aglave of Valrico, Florida, received the $10,000 H. Robert Horvitz Prize for Fundamental Research for her investigation into a natural alternative treatment against citrus greening disease (known as huanglongbing, or HLB). Aglave, a 15-year-old who attends Strawberry Crest High School and grew up on a citrus farm, injected the trunks of infected citrus trees with an extract from …
A study by researchers from the Guangdong Academy of Agricultural Sciences and South China Agricultural University sheds light on the genetic mechanisms that can defend against Asian citrus psyllid (ACP) infestation. ACP is the vector for HLB, the most devastating disease of citrus. The study was published in Horticulture Research on April 1. It unveils the roles of two cytochrome …
The conversation in Florida citrus continues to center around trunk injection of oxytetracycline (OTC). The July issue of Citrus Industry magazine presents the latest information on the OTC topic. OTC product labels require a one-year pause in application after two years of use. This requirement was put in place to prevent pathogen resistance to the product. Florida growers who have …
The U.S. Department of Agriculture Agricultural Research Service (USDA-ARS) citrus scion breeding program recently rediscovered several noteworthy grapefruit cultivars at the A.H. Whitmore Foundation Farm in Groveland, Florida. Among these are the Florida Red, Red Blush and Henderson varieties. These cultivars were originally selected as long shots from the Whitmore Foundation Farm and were planted in 1986. They have survived …
By Davie Kadyampakeni and Miurel Brewer Row middle management is a key area that can improve tree performance. Row middles encompass 80% of citrus orchards, and 70% of the root system of citrus trees was located in row middles before huanglongbing (HLB). Typically, Florida citrus growers manage row middles using physical, chemical and mowing practices, often leaving them free of …
Sponsored Content Q: There have been questions about the effectiveness of ReMedium TI® injections on early varieties like Hamlins. What have you seen from the data collected this past season? Tom Johnson: The early varieties respond well to ReMedium TI® injection. We received data from a grower that had three separate blocks of Hamlins. Each block was about 70 acres. …
The pros of using interstocks for HLB management seemed to outweigh the cons, based on a presentation horticulturist Manjul Dutt made at this spring’s Florida Citrus Growers’ Institute. Dutt is a University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) assistant professor. An interstock is a graft of a citrus selection that can be used as a bridge between …
Sponsored Content In this special series, Tom Johnson, owner of TJ BioTech, tackles questions about optimizing trunk-injection applications to treat HLB. Q: Are there any advantages or disadvantages to making a ReMedium TI® Injection in the rootstock or the scion? Tom Johnson: To start, agronomically there is really no difference in a ReMedium TI® injection into the rootstock or the …
Back in the early days of the HLB fight, it was observed that what is going on underground in citrus tree root systems is just as important as what is happening aboveground. In 2013, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) and U.S. Department of Agriculture-Agricultural Research Service researchers published that 27% to 40% root loss due …
By Jawwad Qureshi The Asian citrus psyllid (ACP, Figure 1) continues to feed on citrus trees infected with citrus greening and spread the disease to newly planted young trees. Therefore, it is not possible to produce a healthy citrus tree in an environment where citrus greening is endemic. Only the citrus under protective screen (CUPS, Figure 2) system allows the …
By Tom Spreen When citrus greening was first discovered in Florida, it did not have a profound impact on production. The big news at that time was the multiple hurricanes that had crossed Florida in 2004 and 2005. The hurricanes served to spread citrus canker so sufficiently that the state of Florida was forced to abandon its efforts to eradicate …
According to Rick Dantzler, Citrus Research and Development Foundation (CRDF) chief operating officer, the past seven days have been busy for CRDF’s committees. First, the Plant Improvement Committee, chaired by grower Joby Sherrod, reviewed several projects and ideas seeking HLB resistance in detail. A three-year plan for the plant improvement programs for University of Florida Institute of Food and Agricultural …
Huanglongbing (HLB) is caused by the bacterium Candidatus Liberibacter asiaticus (CLas), which has been challenging to culture outside its host because of its intracellular nature and genome reduction. Due to these challenges, in-depth research on effective cultivation methods for CLas is essential to develop better control strategies. Such in-depth research was conducted by a team from the U.S. Department of …
Agriculture officials and researchers in California have drastically reduced populations of HLB-spreading Asian citrus psyllids (ACP) through biocontrol measures. Now they’re working on ways to control other insects that are intent on protecting the ACP — Argentine ants. Mark Hoddle, professor of Extension in biological control at the University of California, Riverside, Department of Entomology, explained the ACP/Argentine ant dynamics …
A recent issue of the Annual Review of Phytopathology contains the article, “Management of huanglongbing of citrus: Lessons from São Paulo and Florida.” It discusses the lessons in HLB management, comparing what was done in orchards in Brazil’s state of São Paulo and in Florida. It also highlights the measures that worked and failed from the perspective of controlling the …
