Pathogen Identification and Biological Characteristics of Cymbidium hybridium Blight in Hebei Province
LI Xiaoliu
LI Yanmei
LI Ping
FAN Yongshan
Abstract：In order to clarify the occurrence mechanism of Cymbidium hybridium blight,the pathogen was isolated,purified,identified,and re-inoculated in Hebei province.The biological characteristics of the pathogen were analyzed at the same time.The results showed that the pathogen of Cymbidium hybridium blight in Hebei province was identified as Phytophthora drechsleri,which could produce typic blight symptom after 3 days of wound inoculation.The pathogen was strongly adaptive to environment and could grow well at 24-32 ℃ and pH 4.0-10.0.The optimal growth temperature and pH value of the pathogen was 28 ℃ and 7.0 respectively.The pathogen could grow well in the V8 medium,Chavez medium and CA medium,but poor in PDA medium.A large number of sporangia and sporangiospores could be easily induced after 2 days of continuous illumination in autoclaved water.The germination rate of sporangiospores was above 90.0％ after 12.0 h of moisture culture.The sporangiospore could germinate very well at 20-40 ℃ and pH 4.0-9.0.The optimal temperature and pH value of sporangiospore germination were 30 ℃ and 7.0 respectively.The above results indicated that the pathogen of Cymbidium hybridium blight in Hebei province possessed strong pathogenicity and environmental adaptivity.
Keywords：Cymbidium hybridium blightpathogen identificationPhytophthora drechsleribiological characteristics
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：4( 83-86 )