TY - TH AU - Chicaiza,O. TI - Effectiveness of the visual symptom score in selecting germplasm for resistance to the barley yellow dwarf virus disease in wheat (Triticum aestivum L.) PY - 1981/// CY - Davis, CA (USA) PB - University of California, KW - Agronomic characters KW - AGROVOC KW - Aphids KW - Breeding KW - Breeding methods KW - Disease resistance KW - Dwarfism KW - Germplasm KW - Plant disease manifestations KW - Plant diseases KW - Statistical analysis KW - Viruses KW - Triticum aestivum KW - Wheat KW - Genotypes N1 - Nationality: EC; Thesis (M.Sc.) ER -