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1983年从湖南醴陵县水稻品种浙辐802和威优35叶片上发现的圆形病斑,经研究证实为Nigrospora oryzae(Ber. and Br.)Fertch引起的。本文对该病的症状作了描述,对病菌的某些生理性状作了研究,并将在水稻和稗上分离的病菌交互接种。结果可以相互感染。病害发生规律观察表明,病害发展受水稻生育期制约,齐穗期后病情急剧加重。目前推广的品种间发病无显著差异,不同氮、磷、钾施肥水平对病害发生影响不大。从孕穗末期开始先后喷药两次。供试药剂稻瘟净(0.5%),克瘟散、富士一号、三环唑、托布津、山苍子油(均为0.1%)和50ppm井岗霉素,均无显著防效。
The circular lesion found on the leaves of Zhejiang wheat varieties Zhefu 802 and Weiyou 35 in 1983 in Liling County of Hunan Province was confirmed as Nigrospora oryzae (Ber. And Br.) Fertch. This article describes the symptoms of the disease, studies some of the physiological traits of the bacteria, and inoculates the bacteria isolated on rice and barnyardgrass. The results can be mutually infected. Morphological observation showed that disease development was restricted by the growth period of rice and the disease became worse after full heading. There is no significant difference between the varieties of the current promotion, and different levels of nitrogen, phosphorus and potassium fertilizer have little effect on the disease. From the end of booting has sprayed twice. There was no significant control effect of the tested agents such as rice blast net (0.5%), gram blast, Fuji No. 1, tricyclazole, Topazin, Litsea cubeba oil (both 0.1%) and 50ppm Jinggangmycin.