桂花叶枯病调查及病原的鉴定The Investigation of Sweet Osmanthus Leaf Wilt and Identification of its Pathogen
罗萍,朱天辉
LUO Ping1 ZHU Tian-hui*(College of Forestry and Horticulture Sichuan Agricultural University,Ya'an 625014)
摘要(Abstract)：
取四川农业大学桂花树(Osmanthus)的南北方向各一枝条,对其叶片总数以及病叶总数进行调查,确认其发病率为87.27%和感染指数为25。以此判断行道桂花树的叶枯病发病状况。在此基础上,对桂花叶枯病的病原进行柯赫假定验证。对病叶进行分离,有三种真菌较优势,将三种菌分别接种到健康植株上,有两种真菌接种的植株发病,其中一种真菌接种后的发病症状与原来桂花叶枯病的症状相同,对病叶进行再分离鉴定,确认桂花叶枯病系交链孢菌属(Alternaria)真菌侵染所致。
According to surveying the total leaf blades and the total diseased leaves in the two branches collected from two different directions(south and north) of sweet osmanthus in Sichuan Agriculture University,it is discovered that the infection rate is 87.27 percent and the infection index is 25.KOCH method was used to identify the pathogeny of leaf wilt of sweet osmanthus on the basis of the results.There were three preponderant fungi in the separated species from diseased leaves.It was found that two fungi could make the plants catch disease and one of them could bring the same symptom as the osmanthus leaf wilt after the three fungi were inoculated on the healthy plants.After identifying the diseased leaves,it is concluded that the Alternaria makes the Osmanthus fragrans Lour catch disease.
关键词(KeyWords)：
桂花叶枯病;发病率;感染指数;交链孢菌
leaf wilt of sweet osmanthus,Incidence of a disease,Index of infection,Alternaria
基金项目(Foundation): 国家自然科技资源共享平台(2005DKA21207-13)资助
作者(Author):
罗萍,朱天辉
LUO Ping1 ZHU Tian-hui*(College of Forestry and Horticulture Sichuan Agricultural University,Ya'an 625014)
DOI: 10.16779/j.cnki.1003-5508.2008.05.008
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