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：2019-001-0001-042
藏品描述：氣溫在18～27℃且濕度大時容易發病，氣溫升高病勢即緩和下來。病菌以菌絲、分生孢子或厚膜孢子，在被感染殘株之葉片或苞葉上殘存，環境適合時，菌絲及厚膜孢子會產生分生孢子，於玉米葉上造成感染，再形成分生孢子反覆造成重複感染。病菌侵入葉片後，初為針頭狀斑點，再變成水浸狀紡錘形，繼續擴大為灰綠色紡錘形長斑。當天氣潮濕時，病斑部位之葉片上下表面會產生灰黑色之黴狀物。
Northern corn leaf spot is caused by the fungus Bipolaris zeicola. It is occasionally seen in the lower canopy during periods of high humidity and moderate temperatures. There are five known races of this fungus. Race 2 causes oblong, somewhat rectangular, brown spots on leaves and a black mold on kernels. Race 3 causes long, narrow, light tan lesions that are surrounded by a darker border on leaves, sheaths, and husks. Resistant hybrids and inbreds are available. Crop rotation and tillage reduce inoculum survival. Foliar fungicides labeled for northern corn leaf spot are available.