组培速生楸青枯病及病原调查

Investigation into Bacterial Wilt and Pathogenesis of Catalpa bungei C. A. Mey. Made of Tissue Culture Rapidly

组培速生楸青枯病主要危害地茎和根部,症状类型:1.地茎变黑坏死,上部萎焉死亡,坏死地茎处出现许多小菌核;2.随苗木木质化增高,根部腐烂坏死,植株死亡,坏死病部出现粉状孢子。在温度高湿度大的情况下发病重。经组织分离和接种试验,主要病原菌为Macrophomina phaseolina,其次是Fusarium oxysporum。

Bacterial wilt from Catalpa bungei C. A. Mey. Made of tissue culture rapidly mainly injures stems and roots andsymptom types show that stems become black necrosis and there are many small sclerotia on it, upper parts wilt till death;with the lignification of seedlings increasing, Root decays necrosis and powdery spores on necrotic parts to death. There aremore serious diseases in high temperature and humidity. The main pathogens were identified as Macrophomina phaseolinafirstly and then Fusarium oxysporum by means of tissue isolation and inoculation test.