and Botanist in the Experiment Station, Davis. S See "Literature Cited" for citations referred to in text by author and date. 'To simplify the writing, the term "barley yellow dwarf virus" is further abbreviated to "yellow dwarf virus" and the disease is referred to as "yellow dwarf disease" or simply "yellow dwarf," regardless of the host. Such usage is a compromise because the term "yellow dwarf" does not properly describe the symptoms in certain Gramineae (cf. Oswald and Houston, 1953a, b).