张家口市胡麻白粉病发生规律研究

白粉病是胡麻生产中常发性病害之一,对胡麻产量和质量影响很大。为探讨胡麻白粉病在张家口地区的发生规律,于2010年胡麻生长季节在张家口康保县定期定点观察胡麻白粉病的发生程度,分析温度、湿度等气象因素及不同播种密度、长势对胡麻白粉病害发生规律的影响,并对部分主栽胡麻品种进行抗病性评价,以期为胡麻白粉病的综合防控提供参考依据。结果表明：田间降雨量、相对湿度以及雾、露天气出现天数是影响胡麻白粉病发生和流行的主要因素,胡麻栽植密度和长势均可影响白粉病的发生程度。田间抗病性差异显著性分析结果显示,9个参试胡麻品种中没有免疫（I）品种,其中伊亚4号、晋亚7号、陇亚10号、坝亚11号、轮选2号和轮选1号6个品种表现高抗（HR）,陇亚9号表现抗病（R）,宁亚14号表现中抗（MR）,坝亚12号表现高感（HS）。

Study on Occurrence Regularity of Linseed Powdery Mildew in Zhangjiakou

Powdery mildew was one of the frequent disease of linseed,which influenced the yield and quality greatly.The occurrence of linseed powdery mildew was investigated in Kangbao County,Zhangjiakou in 2010.The effects of temperature,humidity,plant density and growth vigor on the occurrence regularity of linseed powdery mildew were analyzed,and the disease resistance of main varieties was evaluated in order to provide reference for the synthetical prevention.The results showed that the rainfall,relative humidity,and the days of fog and dew were the main factors influencing the occurrence and prevalence of linseed powdery mildew.The plant density and growth vigor could influence the occurrence degree.Yiya No.4,Jinya No.7,Longya No.10,Baya No.11,Luanxuan No.2 and Luanxuan No.1 were high resistant to powdery mildew,Longya No.9 was resistant to it,Ningya No.14 was moderately resistant to it,and Baya No.12 was high sensitive to it.