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1980年,在海南岛发现一种木薯细菌病害,此后在广东、广西一些地区的调查,也发现此病,其主要症状是:初时在叶片背面出现水渍状暗绿色角形病斑,随着病斑扩大,叶片凋萎,干枯,最后脱落;被侵染的嫩茎和叶柄渗出橙黄色的胶滴,覆盖在病部表面,随着病斑扩展,病部下陷变褐色,周围着生的叶片凋萎,严重时生长点死亡,顶端回枯,病部维管组织变褐色。通过症状观察,显微镜诊断,致病性测定,病原菌形态观察,染色反应,培养性状和生理生化测定,可以肯定,引起这一木薯细菌性疫病的病原细菌是Xanthomonas manihotis (Arthaud-Berthet) Starr。
In 1980, a cassava bacterial disease was found in Hainan Island. Since then, some diseases in Guangdong and Guangxi have also been found. The main symptoms are: the early appearance of water-like dark green angular lesions on the back of leaves, Spot expansion, leaves withered, dry, and finally fall off; infested tender stems and petioles exudate orange yellow plastic drops, covering the surface of the disease, with the lesion expansion, disease subsidence brown, around the students Leaves withered, the growth of severe death, the top back to dry, diseased vascular tissue brown. Through pathological observation, microscopic diagnosis, pathogenicity determination, morphological observation of pathogenic bacteria, staining reaction, culture traits and physiological and biochemical tests, it is certain that the causative bacteria responsible for this cassava bacterial disease are Xanthomonas manihotis (Arthaud-Berthet) Starr.