Problems encountered in breeding for resistance to Plasmodiophora brassicae through interspecific hybridization

agentes nocivos agronomic characters america biological control brassica brassica napus brassica oleracea breeding breeding aims breeding methods cabbages canada champignon chou pomme crops cruciferae cultivos dicotiledoneas dicotyledons disease resistance diseases economic plants enfermedades fungosas facteur nuisible fungi green vegetables hortalizas (plantas) hortalizas verdes hybridation hybridizing injurious factors lutte biologique methode methods mycose mycoses north america objetivo de mejoramiento pest control methods plantas plante plante de culture plants plasmodiophora quebec repollo resistance to injurious factors resistencia a la enfermedad rhoeadales vegetable crops