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Huanglongbing / Citrus Greening (Liberibacter asiaticus)
Updated 7-13-07 (To quickly find the most recent postings, look for this: NEW)
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Current News |
Biology |
Response/Regulation |
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NEW Citrus greening continues to spread in FL counties. Updates and discussion to occur at APS meeting. 7-13-07 Vietnam scientists find cure for citrus tree disease Thanh Nien Daily - Ho Chi Minh City,Vietnam Scientists in Vietnam have discovered the means to prevent the citrus greening disease which infects a majority of fruit trees in the country’s south. ... (Posted 1-9-07) War on canker lost after massive destruction
Charlotte Sun-Herald - Charlotte,FL,USA... A more troubling bacteria that causes a fatal citrus disease called greening began to spread from initial discovery in South Florida. ... Canker
continues to be discovered State seeks OK from US to ship fresh citrus fruit Palm Beach Post - FL, United States Posted 4-16-06 ... Florida Agriculture Commissioner Charles Bronson has asked the US Department of Agriculture to temporarily allow shipment of fresh Florida citrus to non-citrus ... Canker found in DeSoto, Charlotte groves Charlotte Sun-Herald - Charlotte,FL,USA Posted 4-4-06 ... A new "citrus health" plan is being drafted now that will address both canker and citrus greening, a bacterial disease spread by an insect called a psyllid. Welcome to Florida. Have a . . . nectarine? Centre Daily Times - Centre County, PA,USA Posted 4-3-06 ... Fear that canker and greening, which has already rocked the commercial citrus industry back on its heels, could become even more devastating. Killer citrus disease spreads in area Charlotte Sun-Herald - Charlotte, FL,USA Posted 3-22-06 The tree-killing citrus disease called greening has been confirmed by laboratory tests in two DeSoto County orange trees off Airport Road. NEW Study Predicts Citrus' Future Lakeland Ledger - Lakeland, FL,USA Posted 3-22-06 ... That assumes a high number of trees lost to citrus greening with additional losses to canker. ... Greening, also a bacterial disease, kills citrus trees. NEW Citrus greening found in Cape The News-Press - Fort Myers, FL,USA Posted 3-22-06 ... State agriculture officials have confirmed a case of citrus greening at a residence in northwest Cape Coral, according to a map posted by the state agriculture Citrus
lovers, it's once again time to put down roots
Sun-Sentinel.com - Fort Lauderdale, FL,USA Posted
3-17-06 ... Not only is citrus canker still an enormous problem
in the state, now citrus greening is on the industry's radar screen as
well. ... Still No Agreement On Canker The Ledger - Lakeland, FL,USA POsted 3-16-06 ... One area of widespread agreement is that all nurseries will have to grow indoors to protect against the spread of canker; citrus greening, a fatal bacterial ... Plan: No removal for citrus Palm Beach Post Posted 3-8-06 ... current legislative session. Pete Timmer, a University of Florida plant pathologist based at Lake Alfred, said that whatever takes the place of the 1,900-foot rule could be as ... Future of Florida citrus mired in uncertainty North Port Sun Posted 3-8-06 ... said. Browning is director of the University of Florida's Citrus Research and Education Center. Browning said canker researchers are now trying to: * Decode the genes of citrus. If ... Seeds planted for trees' return The News-Press - Fort Myers, FL,USA Posted 3-2-06 ... trees, Compton said. The trees still could get reinfected with canker or other diseases, such as citrus greening. Greening has been ...
Need more news? Check out the HLB
News Archive
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Jan 19, 2006, 1-3 pm. HLB training via polycom through the UF
Department of Plant Pathology and the FL Department of Ag.
The Citrus Greening training via Polycom took place
at 15 sites (see the list below). The
presentations available for download below may be used for educational
purposes with permission. Please contact
Carrie Harmon or the authors for
more information.
NEW Video of this training is available here. NEW
| Topic | Speaker | Files to download |
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In response to the threat of citrus greening/huanglongbing (HLB) and its vector, the Asian citrus psyllid, the University of Florida/IFAS Extension, SPDN, and FDACS-DPI, co-coordinated a statewide Polycom videoconference training for UF/IFAS county extension agents on Thursday, January 19, 2006 from 1-3 PM. A special short update on the citrus canker eradication program immediately followed the session on citrus greening. Please see the agenda in the table above. The following sites participated in this Polycom training session: McCarty Hall in Gainesville (host site), TREC at Homestead, SFREC at Immokalee, Ft. Lauderdale REC, Plant City Campus at Hillsboro CC, Gulf Coast REC at Balm, Indian River REC at Ft. Pierce, CREC at Lake Alfred, MFREC at Apopka, and the following county extension offices: Key Largo, Duval, Bay, Washington, Palm Beach and Jackson
Citrus Greening Training Session FAQ
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Questions |
Answers |
| How fast does the disease progress? How far do psyllids fly? | We suspect, from FL observations and reports from around the world, that the syndrome can develop 8-12 wks post-inoculation; however, literature says it may be months to years before symptomss are visible. The vectors may be able to fly 0.9 miles (African psyllid), possibly even further. |
| Psyllids - how do they overwinter? | Overwinter as adults on the undersides of leaves. When the new flush comes out, they lay eggs. |
| How many counties have been confirmed to have the disease? | Approximately 12 right now, clustered mostly in the southeastern part of the state. |
| What can homeowners do to manage this disease? | Chemical control is not a good control option for homeowners (hard to coordinate with other tree owners, kills beneficials); however the following are possible options: don't share or move citrus plants, buy clean plants, biological control may be an option - ladybugs are good, buy resistant plants (in the future, not really available now), avoid the use of citrus relatives in the landscape (serve as reservoirs for vector and maybe the disease), and remove infected plants ASAP (fruit tastes bad, won't ripen, and the trees look bad). |
| What should county faculty do if someone thinks they may have a citrus sample? | When you see something abnormal (mottled leaves, sectoring, lopsided fruit), collect a sample (collect fruits, flowers, leaves, stems if possible; a range of symptoms, transition zone between diseased and healthy tissues). Practice good sample hygiene - decontaminate packaging, tools, and self. Complete the sample form - call for more information if you need to, but this information is very important (host plant, where collected, etc). Consider using DDIS or emailing or enclosing digital images. Place everything, double-bagged, into a sturdy box, and dispatch it to a lab - DPI or IFAS. |
| Will there be a list of approved nurseries or plants? | DPI is working with the FL nurseries. In the interim, DPI is inspecting nurseries and setting up interim guidelines for management. |
| Large nurseries have been affected, may not be able to plant citrus, homeowners want to know when they can plant citrus? | 60% of commercial citrus nurseries have been closed due to canker; as we transition to a new program, there will be a shortage of nursery stock. Homeowners who want to plant citrus may need to wait until the citrus canker eradication program transitions into more of a management strategy. Quarantines and planting prohibitions are still in place, so it is still illegal to plant citrus in areas with the planting prohibition in place. |
| What is the best way to get rid of an infected tree? | Several considerations: if you can bag a small tree and put it with the trash, that's good. |
| Are limeberry and wild lime problem plants? | Limeberry is known to be a host in other places, but wild lime doesn't seem to be a good host for the vector, although it may be a host for the disease. |
| What about setting up new nurseries where the disease does not exist yet? | This would be a good idea for citrus nurseries - some nurseries may relocate to northern parts of the state. Those interested in this information may want to contact Dr. Jim Graham (UF/IFAS-CREC), who is currently working with a team of industry and scientific representatives to establish a plan for the newly emerging citrus nursery industry. His email address is jhg@crec.ifas.ufl.edu. |
| What is being done about the vectors and hosts at nurseries? | Nurseries are being regulated and inspected, and the host material is placed under quarantine if the disease or vector are found, but this is complex and difficult. |
| Citrus canker update from Richard Gaskalla, FDACS-DPI | (this update paraphrased for this notes section) "Current status of the program - the USDA has decided that eradication is no longer feasible; we will need to transition to something new. A quick overview of the program and where we will be going: the FL citrus industry is a 9 billion dollar industry, which we have been striving to protect in the last ten years with the eradication program. The new program will be lead by UF-CREC, and the USDA will appoint a citrus canker working group made up of researchers, regulators, and growers. Over the next 90 days, we will be developing an umbrella program to deal with HLB, canker, and those citrus pathogens that are not yet here, but that we need to prepare for. Out goal is to protect citrus in FL long term. We are no longer pursuing eradication, but are transitioning to a management program. We are no longer removing trees within the 1900 ft radius; only infected trees will be removed. Once it is developed, we will communicate details of the program through the DPI website and through UF-IFAS." |
| What is the connection between leafminers and citrus canker? | Richard Gaskalla mentioned this connection when he was discussing some the differences between the successful 1915-33 and 1986-94 canker programs in which there was no leaf miner involvement, and the program which commenced in 1995, which is much more complicated because of leafminer wounding. Please link to this PDF for more explanation. It is reported from Japan that inoculum efficiency for successful infection is about 100 to 1000 times greater when wounds are present. Leafminers provide almost perfect wounds that remain receptive to inoculum for days. |
| Where can we go for more information? | This SPDN website will be updated continually (http://spdn.ifas.ufl.edu/Citrus _Greening.htm) and you can also direct people to the UF-CREC HLB website at http://www.crec.ifas.ufl.edu/CRECHOME/citrus_greening.htm. You can also call the DPI hotlines at 800-850-3781 (Miami-Dade, Broward, Palm Beach, and Monroe counties) or 800-282-5153 (all other counties) or check the DPI website at www.doacs.state.fl.us/pi. |
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IFAS All Rights Reserved
Online since April 24, 2003
Contact Carrie
Harmon, the
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