摘要
1991~1994年从辽宁省玉米茎腐病主要发生区采集病株标样493株,自茎基1~2节和根部取病组织做常规分离,经单孢或单菌丝纯化后,进行病原菌种类鉴定和致病性测定.结果表明,Fusariumgraminearum和Pythiumsp.分离频率高,致病力强.F.moniliforme和F.equiseti也具一定致病力,但分离频率较低.因此.认为F.gruminearum和Pythiumsp.是辽宁省玉米茎腐病的优势致病菌种类.
s: 493 samples from diseased plants were collected from heavily diseased areas in Liaoning province in 1991 ̄1994. Pathogens were obtained by conventional methods from 1 ̄2 nodes at stem base and root systems of diseased plants. Pathogens purified through selecting single spore of hypha were identified,and their pathogenicitiesWere assayed. Results showed that Fusarium graminearum and Pythum sp. were iaolatedmost frequently,and with the highest pathogenicities,whereas F. moniliforme and F. equiseti,to a cercain extent, had pathogenicity, but their isolation frequencies were lower. Itwas concluded that F. graminearum and Pythium sp. were dominant pathogens causingcorn stalk rot in Liaoning province.
出处
《玉米科学》
CAS
CSCD
1995年第A01期40-42,共3页
Journal of Maize Sciences
关键词
玉米
茎腐病
病原菌
致病力
Corn stalk rot
Pathogenicity
Isolation percent