BREEDING FOR BASAL ROT RESISTANCE IN NARCISSUS
Data are presented on the survival of immature Narcissus (daffodil) bulbs grown in compost infested with chlamydospores of Fusarium oxysporum f.sp. narcissi as part of a breeding programme to select lines resistant to basal rot. These indicate an essentially additive nature for the inheritance of basal rot resistance. Cultivars Rijnveld's Early Sensation, St. Keverne, Malvern City, Fortune and five new Narcissus lines proved to be excellent parents in passing on basal rot resistance to their progeny. Carlton, Dawley and Unsurpassable were deemed intermediate whilst Rembrandt, Forescate, King Alfred, Dutch Master and Golden Harvest were poor parents. Variation in ranking of general combining ability (GCA) from trial to trial shows that caution is needed when interpreting parental values based only on a single trial. Continued progeny losses during the storage period after Fusarium challenge were attributed to latent infections.
Bowes, S.A. (1992). BREEDING FOR BASAL ROT RESISTANCE IN NARCISSUS. Acta Hortic. 325, 597-604