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：2019-001-0001-055
藏品描述：本病又稱早疫病，主要危害葉片、莖，果實亦可被害。葉片罹病時，初期葉片呈暗褐色至黑色水浸狀小斑點，後逐漸擴大成革質化輪紋狀斑點，周圍有黃色暈環，下部老葉被害若嚴重時，多數病斑癒合而導致葉片脫落。莖部被害則引起側枝掉落。果實被害則呈褐色凹陷輪紋狀病斑，可遍及全果實而致果實腐爛。幼苗被害極易死亡。本病為空氣傳播病害，分生孢子可藉氣流與雨露傳播，發芽後可直接侵入寄主表皮組織，誘發病害。春、秋季時，潮溼與溫暖的環境適合發病，多施肥時，病害較輕微。
Early blight can be caused by two different closely related fungi, Alternaria tomatophila and Alternaria solani. Both pathogens can also infect potato. Early blight is one of the most common tomato diseases, occurring nearly every season wherever tomatoes are grown. It affects leaves, fruits and stems and can be severely yield limiting when susceptible cultivars are used and weather is favorable. Severe defoliation can occur and result in sunscald on the fruit.