Dody, Donald Gene.2015-12-312015-12-311961http://hdl.handle.net/2097/25471Call number: LD2668 .T4 1961 D64Aphids as carriers of disease.Barley yellow dwarf viruses.The transmission of the barley yellow dwarf virus by the greenbug, Toxoptera graminum (Rondani)TextMasters theses