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Research on Biological Characteristics of Periwinkle Powdery Mildew

[Objective] The aim was to understand effects of different factors on spore germination of periwinkle powdery mildews. [Method]Under laboratory conditions,effects of different carbon,nitrogen source,temperature,light and p H on the asexual spore powder of periwinkle powdery mildew were studied systematically. [Result] The suitable carbon sources for spore germination were sucrose,lactose and maltose,and the suitable nitrogen sources were L-alanine and L-leucine; the suitable p H value was between 7 and 10; 18 ℃ or whole light was more suitable for the spore germination. [Conclusion] The results provide theoretical basis for the control of periwinkle powdery mildews.