Citrus Huanglongbing (HLB), also known as greening, is one of the most serious citrus plant diseases in the world. Infected trees produce bitter fruits that are green, misshapen, and unsuitable for sale. Once a tree is infected, there is no cure and it typically dies within a few years. Greening has already devastated the Florida citrus industry and poses a threat to California and Texas as well as Australia and the Mediterranean region.
Currently the most effective ways to prevent the spread of HLB are to stop the causal agent (Candidatus Liberibacter asiaticus) using quarantine measures, control the insect that spreads the disease (Asian citrus psyllid), remove the diseased trees, and plant HLB free trees. To this end, early diagnosis of HLB-diseased trees is crucial. Traditionally, diagnosis relies on observing blotchy mottle symptoms and confirming disease presence using molecular tools. However, these symptoms do not show until months after disease transmission and by then the disease has likely already spread throughout the grove.
Professor Nian Wang and his postdoctoral research associate Dr. Sheo Shanker Pandey, both from Citrus Research and Education Center, Department of Microbiology and Cell Science, at the Institute of Food and Agricultural Sciences of University of Florida, developed a strategy for early diagnosis of HLB before the appearance of blotchy mottle symptoms. They used a low-cost staining method to identify insect feeding sites and tested those identified sites for the causal agent using quantitative real-time PCR (polymerase chain reaction).
Through this method, the pair were able to detect the HLB causal agent up to two days after transmission and long before the appearance of symptoms. This early detection will enable citrus growers to prevent the spread of HLB in their fields. This finding is especially crucial for California, Texas, Australia, and the Mediterranean region as those areas are currently plagued by HLB.
More details about this study can be found in “Targeted Early Detection of Citrus Huanglongbing Causal Agent ‘Candidatus Liberibacter asiaticus’ Before Symptom Expression” in Phytopathology Volume 109, Number 6, published June 2019. Phytopathology is an international journal publishing articles on fundamental research that advances understanding of the nature of plant diseases, the agents that cause them, their spread, the losses they cause, and measures used to control them.
The Latest on: Citrus greening
via Google News
The Latest on: Citrus greening
- Florida's Natural saw 12% sales revenue growth in 2019-20, grower-members benefitedon November 27, 2020 at 12:26 pm
The Lake Wales juice cooperative benefited from a boom in retail grocery sales during the COVID-19 shutdown. Other parts of its business suffered.
- Brazil and US scientists discover molecule that has destroyed millions of citrus groveson November 24, 2020 at 12:09 am
Citrus greening, or Candidatus Liberibacter asiaticus, is incurable and one of the most serious citrus plant diseases in the world, according to the United States Department of Agriculture.
- Citrus bug: HLB disease, finger limes and a $1bn threat to Australian orange, lemon treeson November 20, 2020 at 6:07 am
Also known as citrus greening, it’s one of the most severe plant diseases – a kind of COVID-19 for citrus, except more lethal. It is caused by a bacteria spread by the Asiatic citrus psyllid ...
- Riverside rallies to save original California orange treeson November 18, 2020 at 6:01 pm
But today the tree that made it all possible is at risk of contracting citrus greening disease, caused by a bacterium called huang long bing. In Chinese, Moses says, huang long bing translates ...
- The citrus disease that devastated Florida oranges is now in Riversideon November 18, 2020 at 6:01 pm
It's called 'Huanglongbing,' or Citrus Greening Disease. "This disease is a devastating plant disease that basically starves citrus trees of nutrients and eventually kills the tree," Joyce Jong ...
- U.S. 27: The Citrus Highwayon November 17, 2020 at 4:00 pm
Today, many groves have turned to dust, wiped clean by development, decades of devastating freezes, cankers, hurricanes, or, most recently, fast-spreading citrus greening. Citrus arrived via ...
- U.S. 27: The Future of Florida's Citrus Industryon November 17, 2020 at 4:00 pm
For years, farmers have had to fend off freezes and economic challenges, but a new enemy has proven to be the industry’s largest challenge yet — citrus greening. Also called HLB, which comes ...
- Texas A&M AgriLife researchers make breakthrough in fighting agricultural plant diseaseson November 17, 2020 at 8:20 am
Texas A&M AgriLife researchers have made a discovery that will help combat fastidious pathogens, which cost U.S. agriculture alone billions of dollars annually. For the past few years, Kranthi ...
- Texas A&M AgriLife Researchers Make Breakthrough In Fighting Agricultural Plant Diseaseson November 17, 2020 at 7:58 am
Texas A&M AgriLife researchers have made a discovery that will help combat fastidious pathogens, which cost U.S. agriculture alone billions of dollars annually. Fastidious plant pathogens infect ...
- Texas citrus weathers Hurricane Hanna with slight dropson November 16, 2020 at 3:59 pm
with grove care and spray programs keeping citrus greening and other issues at bay. “We are constantly planting new acreage to replace old acreage that rotates out and we are always looking for ...
via Bing News