作者：曾惠中

類別：圖書文獻類 - 手稿

材質：紙質

年代：1969~1969

尺寸：長:24.6 x 寬:20.5 (cm)

藏品來源：曾惠中捐贈

登錄號：2019-001-0001-040

藏品描述：病原菌以菌核或菌絲在植株殘體存活，春、秋兩季多雨潮濕時，子囊孢子經氣流傳播而感染老葉。甘藍生長期主要藉接觸傳播，菌核常混雜在種子間可長距離傳播。高濕、排水不良和偏施氮肥之環境，有利於本病之發生。幼苗和成株在莖基部產生淺褐色凹陷腐爛病徵導致發育不良、矮化、減產，莖桿夭折枯死。當葉片受感染，葉部組織出水、腐爛呈黑褐色之黏濕狀。高濕時，患部出現白色菌絲及黑色菌核。

Sclerotinia rot of cabbage is caused by the fungus Sclerotinia sclerotiorum. It can cause serious losses in the field, in storage, and under transit and market conditions. S. sclerotiorum is widely distributed in relatively cool and moist areas throughout the world. Infections may occur on the stem at the soil line, on the leaves at their bases, or where the foliage comes in contact with the soil. The infections begin as tan, water-soaked, circular areas, which soon become covered by white, cottony fungal growth. The host tissue becomes soft and watery as the disease progresses. The fungus eventually colonizes the entire cabbage head and produces large, black, seedlike structures called sclerotia on the diseased tissue.