吉林省玉米茎腐病病原菌组成、分布和优势种研究

Distribution and Dominant species of Corn Stalk Rot Pathogens in Jinn Province

１９９１～１９９５年在吉林省六个地区主要栽培品种上采集１０１６个病株标样．经分离、鉴定及致病性试验重分离验证，明确在吉林省玉米茎腐病病原菌由（Ｆｕｓａｒｉｕｍｓｐ．）和（Ｐｙｔｈｉｕｍｓｐ．）组成．其中（Ｆｕｓａｒｉｕｍｇｒａｍｉｎｅａｒｕｍ）是吉林省的优势种．其次为（Ｆｕｓａｒｉｕｍｍｏｎｉｌｉｆｏｒｍｅ）和（Ｐｙｔｈｉｕｍｓｐ．）。病原菌的组成、分布存在区域间和年度间的差异。在吉林地区是以（Ｐｙｔｈｉｕｍｓｐ．）为优势种。提出玉米茎腐病的研究工作应立足于本生态区内进行，以求达到控制和减少该病害发生危害的目的．

samples of corn stalk rot collected from six locations of Jinn provincewere isolated, identified and determined for pathogenicity. The results showed thatPathogens of corn stalk rot consisted of Fusarium sp. and Pythium sp.. The dominantspeciee if corn stalk rot pathogens are different in different locations and have a littledifference in different years. The dominant species are Fusarium graminearum and followed by F. moniliforme and Pythium sp. in most locations. Pythium sp. is dominantspecies in Jinn city (a location of Jilin province). We think that dominant species of cornstalk rot are different in differnt locations and depend on environmental factors includinghumidity,temperature and microorganism in soil.