Cotton Blue Disease Caused by Cotton leafroll dwarf like virus: Identification, Symptomology, and Occurrence in Alabama
By Kathy S. Lawrence, Ph.D.
Professor of Plant Pathology
Department of Entomology &
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Cotton blue disease, caused by the Cotton leafroll dwarf virus (CLRDV), was detected for the first time in the U.S. in the state of Alabama during 2017. This virus is known to be transmitted by the cotton aphid. Cotton foliar symptoms vary dramatically over the season and across the southeast and may consist of foliar distortion, leaf crinkling of the center of the leaves with curling or rolling toward the outer edges. Leaves may bronze in color or look darker as suggest by the blue name. Symptoms are intense in September toward the end of the season. This presentation is an overview of the initial discovery, and associated plant symptoms. See also the related webcast by Judith K. Brown, “Introduction of Cotton leaf roll dwarf-like Polerovirus into the United States: High-Throughput Discovery, Identification, and Genomic Comparisons.”