Title: Study on Pathogen and Its Biological Characteristics of Alfalfa Downy Mildew
Abstract: [Objective]The research aimed to study the pathogen of alfalfa downy mildew and its biological characteristics.[Method]The disease was observed in the field.Germination rate of sporangium in different temperature,pH and nutrition was examined with suspending drop method.Slide germination method was used to observe its germination in different humidity maintained by different concentration of H2SO4.[Result]The pathogen was Peronospora aestivalis Syd.The optimum temperature range for sporangium sprot was from 15 ℃ to 21 ℃,and the best optimum temperature was 18 ℃.The spore germination percentage reached 5.56% at the humidity of 100%.The spore couldn' t germinate when the humidity was below 95%.The optimum pH range was from 6.15 to 7.69,and the best optimum pH was 6.91.The leaf extract of 1∶5 was good for its germination.[Conclusion] The research provided the basis for the prevention and cure of downy mildew of alfalfa.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 1
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