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First Report of Cotton Leafroll Dwarf Virus in Louisiana

T. Price, R. Valverde, R. Singh, J. Davis, S. Brown, and H. Jones

April 2020


Cotton leafroll dwarf virus (CLRDV) has recently been discovered in the southern United States. The virus is transmitted by the cotton aphid and causes numerous symptoms including foliar chlorosis, distortion, leaf cupping, and reddened leaf veins. These symptoms were observed in a field in northeast Louisiana during the summer of 2019 approximately 2 weeks after cotton aphid infestation. Grafting infected cotton plants with healthy ones resulted in similar symptom development, and molecular diagnosis initially indicated and then confirmed the presence of CLRDV in sampled and grafted specimens, respectively. This the first report of CLRDV in Louisiana.


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