河南省玉米茎腐病病原菌分离与致病性测定

Isolation and Pathogenicity Determination of Pathogen for Corn Stalk Rot in Henan Province

连续两年从河南省主要玉米产区采集玉米茎腐病病害标本进行分离,对病原菌的种类和致病性进行鉴定与测定。结果表明,河南省玉米茎腐病的病原菌为禾谷镰孢(Fusarium graminearumSchwabe)、轮枝镰孢(F.verticillioides)和腐霉菌(Pythiumsp.),其中,禾谷镰孢的分离频率最高,平均分离频率为43.12%;轮枝镰孢次之,平均分离频率为23.13%;腐霉菌的分离频率较低,平均分离频率为6.25%。禾谷镰孢的致病性最强,腐霉菌次之,轮枝镰孢的致病性最弱。禾谷镰孢是河南省玉米茎腐病最主要的病原菌。

The pathogens of corn stalk rot were defined by using isolation, identification and pathogenicity determination in Henan province. The results revealed that the pathogens were Fusarium grarninearum, F. verticillioides and Pythiurn sp. , in which, the isolation frequency arrived 43.12% for F. grarninearurn, following by F. verticillioides and Pythiurn sp. , with 23.13% and 6.25% isolation frequency, respectively. The pathogenicity analysis indicated that F. grarninearurn had the strongest pathogenicity, following by Pythiurn sp. and F. verticillioides. In short, F. grarninearum was the most important pathogen of corn stalk rot in Henan province.