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：2019-001-0001-024
藏品描述：主要危害柑橘果實，葉片及枝條也會被感染。本病為潛伏感染，病菌侵入柑橘組織後，要到果實快成熟的貯藏時期才出現病斑，病斑周圍最早變黃，後逐漸擴張為不規則圓形，紅色或褐色，其中央部褪色為灰褐色。果實上的病斑主要分成硬斑、小斑點、腐敗斑及擬黑點。採果時貯藏室溫度在20℃以上，病斑數增加快，小病斑會癒合而成腐敗型或黑斑狀病斑。隨著貯藏期間延長，腐敗型病斑會逐漸增加。
Citrus black spot is a fungal disease caused by Guignardia citricarpa. This Ascomycete fungus affects citrus plants throughout subtropical climates, causing a reduction in both fruit quantity and quality. Symptoms include both fruit and leaf lesions, the latter being critical to inter-tree dispersal. Strict regulation and management is necessary to control this disease since there are currently no citrus varieties that are resistant.