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水稻白叶枯病是影响水稻高产稳产的重要病害之一,大流行年感病品种产量损失可达一半以上,甚至无收.国内研究认为病菌主要在稻种和稻草上越冬,作为次年初次侵染的菌源,在老病区尤以病稻草的传病作用最为重要.通过自1972年以来对水稻白叶枯病的试验、防治工作,感到病种、病稻草虽是主要菌源,但影响病害流行的主要因子却在于气候.因此,探索影响流行的气候因素,进而应用于预测预报,是非常必要的.我县是白叶枯病的老病区.水稻布局是单、双季稻并存,早、中、晚稻混栽.早稻生长期间气温由低到高,由于高达25℃以上的时间较迟,故发病较晚,一般受害不重.晚稻进入生长后期则受气温下降到25℃以下的限制,受害亦不重.中稻孕穗～抽穗期多在7月中旬到8月中旬,这一期间天气条件有利于发病,受害亦最重.
Rice bacterial leaf blight is one of the most important diseases that affect the high and stable yield of rice, and the yield loss of the annual pandemic susceptible varieties can reach more than half, or even no harvest.According to the domestic research, the pathogen mainly overwinters on rice seeds and straw, Infectious bacteria sources, especially in the ward disease disease most important role of the disease straw.By 1972 years since the test of bacterial leaf blight, prevention and treatment, feel sick, although the straw is the main source of disease, but Therefore, it is very necessary to explore the climatic factors influencing the epidemic, and then to forecast and forecast, and my county is the old ward of bacterial blight.The layout of rice is single and double cropping rice co-exist , Early, middle and late rice mixed planting.During the growth of early rice during the temperature from low to high, due to late as late as 25 ℃ above, so the onset is late, the general damage is not heavy late rice into the late growth by the temperature dropped to below 25 ℃ Of the restrictions, the victim is not heavy.Magnetic booting ~ heading date and more in mid-July to mid-August, during which the weather conditions conducive to the incidence, the hardest hit.