In August 2017, Kathy S. Lawrence, a plant pathologist at Auburn College, acquired a name from Drew Schrimsher of Agri-AFC, who had found foliar distortion and leaf curling and rolling on roughly 50,000 acres of cotton in southeastern Alabama. After ruling out herbicide harm, Schrimsher contacted Lawrence, and she or he visited the fields 2 days later.
Lawrence took samples and despatched them to Judith Ok. Brown on the College of Arizona. After 7 months of analysis, Brown linked the signs to cotton blue disease, brought on by Cotton leafroll dwarf virus (CLRDV). The illness had by no means been seen in the USA. It was first reported in Africa in 1949 after which not once more till 2005, when it was reported in Brazil.
Reported from six counties in coastal Alabama in 2017, cotton blue illness affected roughly 25% of the state’s cotton crop and brought on a four% yield loss. The illness was reported once more in 2018, affecting Three-100% of cotton fields in Alabama however inflicting solely a 1% yield loss.
Signs, which embrace slowed plant growth, lack of chlorophyll, and dwarfing of contaminated leaves, normally don’t seem till final August after full bloom. To this point, there aren’t any beneficial methods for administration of this illness.
The complete story behind the invention of cotton blue illness in Alabama is offered in two “Concentrate 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 Ok. Brown.
Each displays can be found by way of the “Concentrate on Cotton” useful resource on the Plant Administration Community. This useful resource comprises greater than 75 webcasts, together with displays from six conferences, on a broad vary of elements of cotton crop administration: agronomic practices, ailments, harvest and ginning, bugs, irrigation, nematodes, precision agriculture, soil well being and crop fertility, and weeds. These webcasts can be found to readers open access (with no subscription).
The “Concentrate on Cotton” homepage additionally gives entry to “Cotton Cultivated,” a brand new useful resource from Cotton Integrated that helps customers rapidly discover essentially the most present cotton manufacturing info accessible. These and different assets are freely accessible courtesy of Cotton Integrated at http://www.plantmanagementnetwork.org/foco.
American Phytopathological Society
First report of cotton blue illness in the USA (2019, October 17)
retrieved 21 October 2019
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