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由拟黑粉菌Ustilaginoidea virens(Cooke)Tak.引起的稻曲病是目前造成产量损失和降低稻米经济价值最主要的病害之一。许多国家都对稻曲病侵染规律进行了研究,Ou.S.H.(1972)报道在温带病菌以菌核和分生孢子越冬,认为初侵染源主要是菌核产生的子囊孢子,分生孢子在再侵染中起重要作用。又据R.S.Singh等(1985)报道,在印度菌核于田间及室温能存活11个月,菌核为该地区主要的初侵染源。浙江金敏忠等(1987)报道,菌核为当地重要初侵染源应属无疑。浙江许绍朴(1984)、广东黎毓干(1986)、辽宁王玉山(1987)则认为菌核不易发现。在华北一季稻区尚未有菌核存在的报道,我们从1985年开始对稻曲病侵染规律进行了研究,本文主要介绍有关初侵染源的研究结果。
False false smut caused by Ustilaginoidea virens (Cooke) Tak. Is one of the most important diseases causing the loss of yield and reducing the economic value of rice. Many countries have studied the law of infection of rice smut. Ou.SH (1972) reported that in the wintering of bacteria and conidia of temperate pathogen, the primary sources of infection were ascospores and conidia Play an important role in reinfection. According to R. Singh et al. (1985), sclerotium is the primary source of initial infection in the area where Indian sclerotia can survive in the field and at room temperature for 11 months. Zhejiang Jinminzhong et al. (1987) reported that sclerotinia is an important primary source of infection in China. Zhejiang Xu Shaopu (1984), Guangdong Li Yu dry (1986), Liaoning Wang Yushan (1987) that the sclerotia is not easy to find. In the northern part of China, there is no report on the existence of sclerotia in the first season rice in North China. Since 1985, we have studied the rule of infection of rice false smut. This paper mainly introduces the research results of primary infection.