​​Cotton Blue Disease Caused by Cotton leafroll dwarf like virus: Identification, Symptomology, and Occurrence in Alabama

September 2019 | 13 min., 22 sec.
by Kathy S. Lawrence
Auburn University

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Cotton blue disease, caused by Cotton leafroll dwarf like virus (CLRDV), was first detected in the United States in Alabama in 2017. This virus is known to be transmitted by the cotton aphid. Cotton foliar symptoms vary dramatically over the season and across the U.S. Southeast and may consist of foliar distortion, leaf crinkling of the centers of the leaves, and​ curling or rolling toward the outer edges. Leaves may appear bronze or look darker, as suggested by the "blue" name. Symptoms are intense in September toward the end of the season. This presentation is an overview of the initial discovery of the disease 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.”​

About the Presenter

Kathy S. LawrenceKathy S. Lawrence received a BS in agronomy from New Mexico State University and an MS and a PhD in plant pathology from Mississippi State University. Kathy began work with plant-parasitic nematodes as a PhD student, working on Heterodera glycines and sudden death syndrome of soybean. Since 1999, she has served as a soilborne and foliar disease plant pathologist, focusing on nematode and fungal interaction in the Department of Entomology and Plant Pathology at Auburn University in Auburn, Alabama. Her current research focuses on developing holistic management systems for plant-parasitic nematode management of field crop systems.​

Contact Information:
Email: lawrekk@auburn.edu


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