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1985年3月,云南省农科院热带亚热带经济作物研究所(保山潞江坝)果园中,发现毛叶枣(Zizyphus mauritiana Lamk.)和野生酸枣(Zizyphus spinosus Hu.)叶片上产生一种烟煤状黑斑病。1987年4月调查,病害已遍及整个果园。为此对病原菌进行了鉴定,并对病害的发生规律和危害性进行了初步调查研究。该病最初在罹病株叶背面产生零星黑色小点,以后斑点逐渐扩大,成圆形或不规则的黑色病斑,直径0.4～6.0mm。严重时病斑可合并成片,在叶背面复盖较大的面积。叶面呈现黄褐色斑点(见图1),受害叶片成卷曲、扭曲状,易脱落。
In March 1985, Yunnan Academy of Agricultural tropical tropical crops Research Institute (Baoshan Lu Jiangba) orchards found that the leaves of Zizyphus mauritiana Lamk. And wild jujube (Zizyphus spinosus Hu.) To produce a bituminous coal Black spot disease. April 1987 survey, the disease has spread throughout the orchard. To this end, the pathogen was identified, and the occurrence and damage of disease were investigated preliminarily. The disease initially sporadic black dots on the back of diseased leaves, and later the spots gradually expanded into round or irregular black lesions with a diameter of 0.4-6.0 mm. Severe lesions can be combined into pieces, covering a large area on the back of the leaves. Leaves showed brown spots (see Figure 1), the affected leaves into a curly, twisted shape, easy to fall off.