由Sclerotium rolfsii 引起之甘藷白絹病

Abstract

甘藷白絹病為2015 年陸續在彰化、雲林及屏東甘藷栽培田出現之嚴重病害。其主要病徵為藷塊上產生黃褐色圓型病斑，大多數病斑在甘藷採收後雖不會繼續擴大，但嚴重影響品質。由病組織所分離之病原菌，培養時產生白色菌絲，具有扣子體，並會產生褐色菌核 (brown sclerotia)，依據形態及分子鑑定為Sclerotium rolfsii Sacc.。 In 2015, a severe disease outbreak on sweet potato storage root with the symptoms of circular yellowish brown to brown lesions occurred in Chunghua, Yunlin, and Pingtung areas. The pathogen isolated from the diseased tissue had white mycelium, clamp connection, and it produced brown sclerotia, which was identified as Sclerotium rolfsii Sacc. based on these morphological characters and ITS sequence.