Study on Bioassay Methods of Cucumber Downy Mildew

doi:10.3321/j.issn:1000-7091.2006.03.022

Abstract

Abstract: In this paper,the condition of sporangium production of Pseudoperonospora cubensis has been discussed.Cucumber leaf with sporangium can be preserved in low temperature and freezing condition.The optimum temperature of infection is around 20℃.Pseudoperonospora cubensis infects with 16 h/d lighting after keeping darkness and RH over 90% for 24 hours.Comparing six bioassay methods for Pseudoperonospora cubensis,the results illustrated that leaf disk with fungicide floating was better than others in sensitivity and stability aspects.

Key words: Cucumber, Downy mildew, Occurrence condition, Bioassay method

CLC Number:

S436.421.1+1

HAO Yong-juan, WANG Wan-li, LIU Geng-chun, LIU Chun-yan, WANG Yong. Study on Bioassay Methods of Cucumber Downy Mildew[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2006, 21(3): 95-99. doi: 10.3321/j.issn:1000-7091.2006.03.022.

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