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在建阳地区,稻瘟病是威胁稻谷生产的重要病害。1982年早稻穗瘟发生面积达35.96万亩,损失稻谷三千多万公斤。1983年大面积更换抗性较好的品种,使病害流行得到一定控制,近四年来每年发病面积下降到3-8万亩,稻谷损失压低到100-150万公斤。实践证明,种植抗病良种是稻瘟病综合防治的基础。为了更好地开展抗病育种和对品种合理布局提供依据,我们进行了稻瘟病菌生理小种的组成、分布和变化情况的调查。
In Jiangyang area, rice blast is an important disease that threatens rice production. In 1982, an area of 35.96 hectares of morning rice blast occurred, covering more than 30 million kilograms of paddy. In 1983, large-scale replacement of better resistant varieties, so that epidemic disease has been controlled, the incidence of the past four years the area dropped to 3-8 million mu, rice loss down to 100-150 million kilograms. Practice has proved that planting resistant varieties is the basis for comprehensive prevention and control of rice blast. In order to better carry out disease-resistant breeding and provide the basis for the rational distribution of varieties, we conducted a survey on the composition, distribution and changes of races of M. grisea.