摘要
在广西南宁桂花树上严重发生一种叶枯病,从病叶上分离到桂花叶枯病菌（编号CHS）,在致病性测定的基础上,根据病原菌株CHS的形态及ITS序列,将其鉴定为Alternaria alternata（Fr.）Keissler。对该菌的生物学特性研究结果表明：菌丝生长、孢子形成和孢子萌发的最适温度均为28℃;生长发育最适pH值为6～7;不同光环境对该菌菌丝生长发育影响不大,黑光环境最利于孢子萌发;在供试的培养基中PDA最适合菌丝生长和产孢;苯醚甲环唑、咪鲜胺和丙环唑对该菌的抑制作用最强。由A.alternata引起的桂花叶枯病在广西的发生属首次报道。
A sweet osmanthus leaf blight severely occurred in Nanning city,Guangxi,China.The pathogen was isolated and its pathogenicity to sweet osmanthus plants confirmed by inoculation tests.The pathogenic isolate CHS was identified as Alternaria alternata（Fr.）Keissler based on its morphological characteristics and ITS sequence.The optimum temperature and pH value for growth and conidial germination were 28 ℃ and 6-7,respectively.Different conditions of light showed no obvious effect on the mycelial growth.Black light was favorable for conidial production.Tests on fungicidal sensitivity in vitro showed that the pathogen was highly sensitive to difenoconazole,prochloraz and propiconazole.This is the first record of sweet osmanthus leaf blight caused by A.alternata in Guangxi.
出处
《西南农业学报》
CSCD
北大核心
2009年第5期1358-1362,共5页
Southwest China Journal of Agricultural Sciences
基金
广西青年科学基金项目(桂科青0728031)
