Study on the Pathogen Biological Characteristics and Pathogenicity of Grape Downey Mildew from Different Areas(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Title:: Study on the Pathogen Biological Characteristics and Pathogenicity of Grape Downey Mildew from Different Areas

Author(s):: LIU Xu¹; 2; LIANG Man¹; WANG Yang³; YU Ran-yue¹; WANG Hua¹; 2; LI Hua¹; 2; 1.College of Enology，Northwest Agricultural and Forestry University，Yangling，Shaanxi 712100；
2.Shaanxi Engineering Research Center of Viti-Viniculture，Yangling，Shaanxi 712100；
3.College of Plant Protection，Northwest Agricultural and Forestry University，Yangling，Shaanxi 712100

Abstract:: Taking ‘Hongdiqiu’ grape as material，the pathogen biological characteristics and pathogenicity of grape downey mildew from Shaanxi and Chongqing were studied.The results showed that there was no obvious difference on morphological property for sporangium from these two areas.However，the longer sporangiophore and more branches were observed for the downey mildew from Shaanxi areas.Furthermore，all the nitrogen sources including ammonium nitrate，peptone and ammonium chloride showed inhibitory effect on germination sporangium from both the two areas.The three carbon source including glucose，maltose syrup and sucrose had same effect on sporangium germination.The sporangium could germinated at the pH value between 4.5～8.5.However，the optimum pH value for germination sporangium from Shaanxi was higher than that of Chongqing.The optimum temperature was 20℃ for germination sporangium from the two areas，which showed highest germination rate under conditions of water film.The disease index in leaf disks was mainly 0 and 1 by the culture in vitro，and grade 1 was mostly observed.

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Last Update: 2014-08-23