DPV32 Figure 01

Barley yellow dwarf virus

Symptoms caused by four isolates of barley yellow dwarf virus in single plants of Coast Black oats 56 days after inoculation by Rhopalosiphum maidis (RMV), R. padi (RPV and PAV) and Macrosiphum avenue (MAV). H is a comparable healthy plant originally infested with virus-free aphids as a control. Photograph by H. H. Lyon, Jr. (From Phytopathology 59: 1582, 1969).