Nav: Home

First report of cotton blue disease in the United States

October 17, 2019

St. Paul, MN (October, 2019)--In August 2017, Kathy S. Lawrence, a plant pathologist at Auburn University, received a call from Drew Schrimsher of Agri-AFC, who had discovered foliar distortion and leaf curling and rolling on approximately 50,000 acres of cotton in southeastern Alabama. After ruling out herbicide damage, Schrimsher contacted Lawrence, and she visited the fields 2 days later.

Lawrence took samples and sent them to Judith K. Brown at the University of Arizona. After 7 months of research, Brown connected the symptoms to cotton blue disease, caused by Cotton leafroll dwarf virus (CLRDV). The disease had never been seen in the United States. It was first reported in Africa in 1949 and then not again until 2005, when it was reported in Brazil.

Reported from six counties in coastal Alabama in 2017, cotton blue disease affected approximately 25% of the state's cotton crop and caused a 4% yield loss. The disease was reported again in 2018, affecting 3-100% of cotton fields in Alabama but causing only a 1% yield loss.

Symptoms, which include slowed plant growth, loss of chlorophyll, and dwarfing of infected leaves, usually do not appear until last August after full bloom. To date, there are no recommended strategies for management of this disease.

The full story behind the discovery of cotton blue disease in Alabama is presented in two "Focus on Cotton" webcasts: the 13-minute "Cotton Blue Disease Caused by Cotton leafroll dwarf like virus: Identification, Symptomology, and Occurrence in Alabama," by Kathy S. Lawrence, and the 33-minute "Introduction of Cotton leaf roll dwarf-like Polerovirus into the United States: High-Throughput Discovery, Identification, and Genomic Comparisons," by Judith K. Brown.

Both presentations are available through the "Focus on Cotton" resource on the Plant Management Network. This resource contains more than 75 webcasts, along with presentations from six conferences, on a broad range of aspects of cotton crop management: agronomic practices, diseases, harvest and ginning, insects, irrigation, nematodes, precision agriculture, soil health and crop fertility, and weeds. These webcasts are available to readers open access (without a subscription).

The "Focus on Cotton" homepage also provides access to "Cotton Cultivated," a new resource from Cotton Incorporated that helps users quickly find the most current cotton production information available. These and other resources are freely available courtesy of Cotton Incorporated at http://www.plantmanagementnetwork.org/foco.
-end-


American Phytopathological Society

Related Cotton Articles:

HudsonAlpha plant genomics researchers surprised by cotton genome
Plant genomics researchers at HudsonAlpha Institute for Biotechnology announce the surprising results of a cotton sequencing study led by Jane Grimwood, Ph.D., and Jeremy Schmutz, who co-direct the HudsonAlpha Genome Sequencing Center (HGSC).
Picking up threads of cotton genomics
In Nature Genetics, a multi-institutional team including researchers at the US Department of Energy (DOE) Joint Genome Institute (JGI) has now sequenced and assembled the genomes of the five major cotton lineages.
Neither surgical nor cotton masks effectively filter SARS COV-2
Both surgical and cotton masks were found to be ineffective for preventing the dissemination of SARS-CoV-2 from the coughs of patients with COVID-19.
Fungi found in cotton can decrease root knot nematode galling
Gregory Sword and colleagues at Texas A&M University inoculated cotton seeds with a diverse array of fungal isolates and tested the resulting seedlings in greenhouse trials for susceptibility to gall formation by root knot nematodes.
Why does your cotton towel get stiff after natural drying?
The remaining 'bound water' on cotton surfaces cross-link single fibers of cotton, causing hardening after natural drying, according to a new study conducted by Kao Corporation and Hokkaido University.
DNA riddle unravelled: How cells access data from 'genetic cotton reels'
With so much genetic information packed in such a tiny space, how cells access DNA when it needs it is something of a mystery.
Long-term analysis shows GM cotton no match for insects in India
In India, Bt cotton is the most widely planted cotton crop by acreage, and it is hugely controversial.
What if mysterious 'cotton candy' planets actually sport rings?
Some of the extremely low-density, 'cotton candy like' exoplanets called super-puffs may actually have rings, according to new research published in The Astronomical Journal by Carnegie's Anthony Piro and Caltech's Shreyas Vissapragada.
Benefits of integrating cover crop with broiler litter in no-till dryland cotton systems
Although most cotton is grown in floodplain soils in the Mississippi Delta region, a large amount of cotton is also grown under no-till systems on upland soils that are vulnerable to erosion and have reduced organic matter.
Implementing no-till and cover crops in Texas cotton systems
Healthy soil leads to productive and sustainable agriculture. Farmers who work with, not against, the soil can improve the resiliency of their land.
More Cotton News and Cotton Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Climate Mindset
In the past few months, human beings have come together to fight a global threat. This hour, TED speakers explore how our response can be the catalyst to fight another global crisis: climate change. Guests include political strategist Tom Rivett-Carnac, diplomat Christiana Figueres, climate justice activist Xiye Bastida, and writer, illustrator, and artist Oliver Jeffers.
Now Playing: Science for the People

#562 Superbug to Bedside
By now we're all good and scared about antibiotic resistance, one of the many things coming to get us all. But there's good news, sort of. News antibiotics are coming out! How do they get tested? What does that kind of a trial look like and how does it happen? Host Bethany Brookeshire talks with Matt McCarthy, author of "Superbugs: The Race to Stop an Epidemic", about the ins and outs of testing a new antibiotic in the hospital.
Now Playing: Radiolab

Speedy Beet
There are few musical moments more well-worn than the first four notes of Beethoven's Fifth Symphony. But in this short, we find out that Beethoven might have made a last-ditch effort to keep his music from ever feeling familiar, to keep pushing his listeners to a kind of psychological limit. Big thanks to our Brooklyn Philharmonic musicians: Deborah Buck and Suzy Perelman on violin, Arash Amini on cello, and Ah Ling Neu on viola. And check out The First Four Notes, Matthew Guerrieri's book on Beethoven's Fifth. Support Radiolab today at Radiolab.org/donate.