甘肃省胡麻白粉病发生规律研究

摘要

From 2011 to 2012 , we investigated the field occurrence regularity of linseed powdery mildew ( Oidium Lini Skoric) in Gansu province, and analyzed the influence of temperature, humidity on its occurrence and development. The results showed that powdery mildew occurred in middle -late -June, and reached a peak in mid-early-July. It only takes 15-20 days from sporadic occurrence to a whole field under natural conditions. The optimum occurrence temperature was 20℃ to 25 ℃, it grows slowly below 20 ℃ or above 25 ℃. Under optimum temperature, heavy rainfall and humidity were bene-ficial to it growth.%2011-2012年对甘肃省胡麻白粉病田间发生规律进行了系统的观察,分析了温度和湿度对病害发生程度的影响。结果表明：白粉病在6月中下旬始发,7月中上旬达到高峰,且在田间自然条件下零星发生至全田发生只需要15-20 d左右,发生的最适温度为20-25℃,低于20℃或高于25℃发生缓慢。最适温度下,降雨量大、高湿条件利于白粉病的发生。