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白叶枯病是水稻重要病害之一。1958年以来,临沂地区稻田面积逐年发展,随着调运稻种,病害传播的范围也逐年扩大。往年缺乏资料,1964年我们在郯城、日照两县作了初步调查。一、发病症状:开始发病时,叶尖以下的边缘先形成绿色水清状长形病斑,后沿叶脉迅速向叶基部发展,颜色由黄绿变棕色以致灰白色。清晨经光线照射,可见淡黄色粘液状颗粒,此即病原细菌。二、发病特点:前期缓慢,后期迅速,从下而上,由点到面。如6月21日观察田边五号水稻仅地角、地边点片发病,一个多月内发展十分缓慢,至7月底到8月初开始迅速发展。农林
Bacterial blight is one of the important diseases of rice. Since 1958, the area of paddy fields in Linyi has been developing year by year. With the deployment of rice varieties, the spread of diseases has also been expanded year by year. The lack of information in previous years, in 1964 we Tancheng, Rizhao two counties made a preliminary investigation. First, the incidence of symptoms: the onset of disease, the tip of the following edge to form a green water-like long shape of the lesion, followed by rapid development of leaf veins along the base, the color from yellow-green to brown so gray-white. Light exposure early in the morning, visible yellowish mucus-like particles, the pathogenic bacteria. Second, the incidence characteristics: early slow, rapid late, bottom to top, from point to surface. As observed on June 21, paddy fields on the 5th Tianjian only horn, the edge of the patch disease, more than a month of very slow development, to the end of July to early August rapid development. Agriculture and forestry