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丹东地区夏凉、多雨、湿度大,因此,是稻瘟病重病区。一般年份产量损失在5～10%,重的可达20～30%,个别严重地块甚至颗粒不收。稻瘟病的发生与品种、栽培条件、菌源、气象条件都有密切的关系,就其影响范围来看,气象因子引起的病害大流行却是广泛的。因此我们只对气象因子的影响来进行分析并找影响稻瘟病流行的主要因子,这对稻瘟病的预测预报和防治均有重要意义。一、丹东地区历年稻瘟病发生的情况根据1971～1982年的叶瘟、穗瘟发生的情况来看,中等以上发生年出现的频率很高,几乎每隔2～3年就要出现一次。以穗瘟造成的损失最大;叶瘟造成的损失要小于穗瘟;苗瘟
Dandong summer cool, rainy, high humidity, therefore, is a severe blast disease. The loss of production in the general year of 5 to 10%, up to 20 to 30% of the weight of some serious blocks or even not received. The occurrence of rice blast is closely related to varieties, cultivation conditions, bacteria sources and meteorological conditions. In terms of its impact scope, the pandemic caused by meteorological factors is extensive. Therefore, we only analyze the impact of meteorological factors and find the main factors that affect the epidemic of blast, which is of great significance for the prediction and control of blast. First, the occurrence of rice blast in the past years in Dandong According to the occurrence of leaf blast and panicle blast in 1971-1982, the occurrence of middle-above years was very high, almost every 2 to 3 years. The loss caused by ear blast was the largest; the loss caused by leaf blast was less than that of panicle blast; seedling blast