Occurrence of Phoma betae on sugar-beet seeds of Czechoslovak origin and possibilities of suppressing the fungus by disinfection

agricultural chemicals antimicrobials antimicrobien application methods bactericidas champignon checoslovaquia crops cultivos czechoslovakia disease resistance drugs economic plants europa europe fongicide fungi fungicidas fungicides industrial crops medicamentos methode methods pesticide pesticides phoma plaguicidas plantas plantas azucareras plantas industriales plante plante de culture plante industrielle plante racine plants produit agrochimique propagation materials remolacha azucarera resistance to injurious factors resistencia a la enfermedad root crops seed seed treatment semence semillas sugar beet sugar crops traitement des semences tratamiento de semillas