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Wheat Spindle Streak Mosaic Virus in Texas. R. W. Toler, Department of Plant Pathology and Microbiology, Texas A&M University, College Station 77843. L. W. Barnes, Extension Plant Pathologist, Texas A&M University, College Station 77843. Plant Dis. 73:938. Accepted for publication 18 July 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0938A.

Wheat spindle streak mosaic virus is a constraint to winter wheat production, particularly in the northwest portion of Texas, where most of the hard red winter wheat is produced. Virus like symptoms on hard red winter wheat were first observed near Amarillo, Texas, in 1988. Symptoms appeared in early spring and disappeared as temperatures increased. Naturally infected wheat plants displayed symptoms typical of wheat spindle streak mosaic virus (WSSMV) infection, including chlorosis, mottling, and streaking (1). Immunosorbent electron microscopy (ISEM) of symptomatic leaf tissue revealed extremely long (1,200-1,900 nm) flexuous rods, and pinwheel inclusions were observed in fixed tissue. The virus reacted positively to WSSMV antiserum (supplied by S. A. Lommel, Kansas State University) using ISEM (2). The samples were negative when assayed by ISEM for wheat streak mosaic virus. The virus was identified as WSSMV by symptoms, serology, and electron microscopy and was found in wheat from Potter, Castro, and Bailey counties. Cultivars observed to be infected included Sage, TAM 101, and Hawk. This is the first report of WSSMV in Texas, where 3.2 million acres of wheat were harvested in 1988.

References: (1) W. G. Langenberg and H. F. Schroeder. Virology 55:218, 1973. (2) S. A. Lommel et a!. Plant Dis. 70:964, 1986.