溫濕度對百合白絹病發生之影響

Abstract

百合白絹病係由Sclertium rolfsii Sacc.所引起，以人工接種風乾菌核於種球周圍1公分內之土壤，得知5粒菌核（接種源密度爲2.6個菌核／100立方公分土壤）即可致使百合出現黃化病徵，且被害度會隨著菌核接種數目的增加而增加。一般而言，自接種之日起二個星期內病害即可發生。八種受測試之百合品種中以Polyanna和Cote d'Azur較罹病，被害度分別爲0.56和0.50。百合全生長時期皆可遭受白絹病之爲害，被害度以露蕾期最高。Lily southern blight was caused by Scierotium rolfsii Sacc. When 5 dried sclerotia (Inoculum density about 2.6 sclerotia per 100cm^3 of soil) were inoculated into soil around the bulb of lily within 1cm, the yellowing symptom could appear obviously within 2 weeks. Moreover, the disease severity increased gradually with the increasing number of inoculating sclerotia. Eight varieties of lily tested for resistance to S. rolfsii (Sr029) indicated that all of them could be infested in 2 weeks after inoculation. Varieties Polyanna and Cote d'Azur of Lilium asiatic hybrid group were more susceptible than others. All of the growth stages of lily were susceptible to the pathogen especially at the visible bud stage.