从江西农业大学校园内发生金丝桃叶尖焦枯病的病株中,随机采集50片病叶按常规方法分别进行组织分离培养,结果有46片病叶未分离到病菌,4片分离到葡萄孢属(Botrytis)、链格孢属(Alternaria)或曲霉属(Aspergillus)真菌。同时,另取50片相同症状的新鲜金丝桃叶尖焦枯病病叶进行保湿培养,观察病征产生情况,结果绝大多数病叶未有病征产生。病害调查发现,不同生境条件下金丝桃叶尖焦枯病发生轻重显著不同,空旷地阳光直射处金丝桃叶尖焦枯病病叶率为61.3%,病情指数为38.9;而生长于树荫底下无阳光直射处金丝桃叶尖焦枯病病叶率为18.4%,病情指数为9.5。综合上述实验结果认为,发生于江西农业大学校园内的金丝桃叶尖焦枯病不是一种由病原物引起的侵染性病害,而可能是由阳光照射引起。 From Jiangxi Agricultural University campus occurred in the leaves of Sophian Tenebrio disease diseased plants randomly collected 50 diseased leaves by conventional methods were isolated tissue culture, the results of 46 disease leaves were not isolated bacteria, 4 were isolated grapes Botrytis, Alternaria or Aspergillus fungi. At the same time, the other 50 fresh leaves of the same symptom fresh tip of the tip of cokebbed leaves moisturizing culture, observe the signs of the disease, the results of the vast majority of diseased leaves without symptoms. Disease survey found that under different habitat conditions, the occurrence of leaf spot and tip-blight were significantly different. The leaf rate of leaf spot and tip-blight of the hypericum perforatum was 61.3% and the disease index was 38.9 in open direct sunlight. No direct sunlight at the tip of the tip of the secondary disease leaf rate was 18.4%, disease index of 9.5. Based on the above experimental results, it is concluded that the leaf spot scorch of Hypericum perforatum occurring on the campus of Jiangxi Agricultural University is not an infectious disease caused by pathogen, but may be caused by sunlight.