Report of the fifth meeting of the working party on rice breeding - Tokyo, Japan, 4-10 Oct 1954

arroz biogenetistas economic distribution enfermedades de las plantas fitomejoramiento germoplasma germplasm graine hybridation hybridization maladie des plantes multiplication des plantes pests of plants plagas de plantas plant breeders plant breeding plant diseases plant propagation ravageur des plantes resistance to injurious factors rice riz seeds semilla