Biological characterization of Fusarium oxysporum Schl f.sp. vanillae Gordon.

The root-rot was one of important diseases on Vanilla plants,which was mostly caused by Fusarium oxysporum Schl f.sp.vanillae Gordon.The experiment showed:the hyphae could grow between 5-37 ℃,and the optimum temperature was 28 ℃;the range of temperature for germinating conidia was 5-36 ℃,the optimum temperature was 27 ℃;the lethal temperature for spores was 58 ℃ for 10 minutes.Under the different pH value 2.3-12,the hyphae could grow,and the conidia could germinate,the optimum pH for hyphae growth was 6.5,the optimum pH for conidia germination was 4. The treatment of whole illumination could restrain the growth of mycelium,the alternation of darkness and light could promote mycelium growth.