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：2019-001-0001-070
藏品描述：葉片初期為黃綠色小點，可見不明顯淺綠色網紋，漸漸擴大，上有稀疏的白色粉狀物。病斑進展很慢，氣溫漸漸上升，罹病葉片枯黃，最後焦黑。罹病枝條不萌芽或萌芽率降低，致使春茶量下降。
Exobasidium vexans is the most economically significant tea pathogen, causing up to 50% crop yield loss when uncontrolled. E. vexans prefers to attack the young leaves on the lower half of hosts and presents as small yellow translucent leaf spots which progress to lesions. These lesions give the lower surface of the leaf the characteristic blister like appearance.