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Effect of Temperature and Moisture to Sporangium Germination and Formation of Cucumber Downy Mildew(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2012年13期
Page:
151-153
Research Field:
Publishing date:

Info

Title:
Effect of Temperature and Moisture to Sporangium Germination and Formation of Cucumber Downy Mildew
Author(s):
GUO Shu-mei; NIU Zhen-fu
Shandong Agricultural Administrators Collage,Jinan,Shandong 250100
Keywords:
Pseudoperonospora cubensis; temperature and moisture; sporangium germination and formation
PACS:
S 436.421.1+1
DOI:
-
Abstract:
With ‘3rd Lu cucumber’ as test materials,the effect of temperature and moisture to sporangium germination and formation of cucumber downy mildew were studied.The results showed that temperature and moisture showed significant affection on germination and formation of sporangia and the role of moisture was more important than temperature.The sporangia germinated at the temperature ranged from 10 to 30℃,with optimum at 20℃.The germination of sporangia required free water and the sporangia could not germination without free water,even though at saturated humidity.Lesions of downy mildew formed sporangia at the temperature ranged from 10 to 35℃.The quantity of sporangia formed at different temperature was significantly different and more sporangia were formed at 15~20℃.When leaves were wetted，the lesions formed plenty sporangia.The quantity of sporangia formed by wet lesions was significantly more than the leaves in saturated humidity.Lesions did not form any sporangia in dry condition (RH=45%).

References:

[1]Cohen Y,Roten J.Field and growth chamber approach to epidemiology of Pseudoperonospora cubensis cucumbers[J].Phytopath,1971,61:736-737.
[2]石延霞,李宝聚,刘学敏.黄瓜霜霉病研究[J].东北农业大学学报,2002,33(4):391-395.
[3]虞皓,何自福,方羽生,等.温度对黄瓜霜霉病菌产孢及孢子囊萌发的影响研究[J].广东农业科学,2004(5):57-58.

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Last Update: 2014-09-16