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：2019-001-0001-082
藏品描述：甘藷黑斑病是一種重要病害，甘藷在幼苗期、生長期和貯藏期均能發病，主要為害塊根及幼苗莖基部，不侵染地上的莖蔓。育苗期染病，多因種藷帶菌引起，種藷變黑腐爛，嚴重時幼苗枯死或未出土即爛於土中。病苗移栽後，生長弱，葉色淡，莖基部長出黑褐色橢圓形或菱形病斑、稍凹陷、初期病斑上有灰色黴層，後逐漸產生黑色刺毛狀物和粉狀物，莖基部葉片變黃脫落，地下部分變黑腐爛，嚴重時幼苗枯死。
Black rot is a disease of sweet potato caused by the fungus Ceratocystis fimbriata. This disease has resulted in significant losses in storage. The early symptoms on storage roots consist of small circular spots that may at first appear brown to greenish black. These spots continue to enlarge and become dark brown to black. The rot is relatively firm and dry, white-to-gray fuzzy growth appears on the surface near the center of the lesion. Within that growth occurs the most diagnostic sign of black rot: small black fruiting bodies called perithecia. Spores of the fungus are exuded out. This sticky spore mass can contaminate and spread to any healthy roots.