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Systemic Movement of Barley Yellow Dwarf Virus in Small Grains. Stanley G. Jensen, Research Plant Pathologist, Plant Science Research Division, ARS, USDA, Northern Grain Insects Research Laboratory, Brookings, South Dakota 57006; Phytopathology 63:854-856. Accepted for publication 15 January 1973. DOI: 10.1094/Phyto-63-854.

Three cultivars each of wheat, oats, and barley which differed in field susceptibility to barley yellow dwarf virus (BYDV) differed also in the rate of systemic movement of the virus. The more susceptible varieties had the higher rate of systemic movement. In oats, the most rapid movement of BYDV occurred at 21 C with slower movement at higher or lower temperatures. These findings may account for some of the seasonal differences in the expression of BYDV symptoms. Reduced rate of systemic movement of the virus may be one mechanism of resistance genetically controlled in plants.