水稻是主要经济作物,栽培面积大,其产量高低直接决定全年农业能否增产。多年来,水稻白叶枯病、纹枯病、水稻二化螟、褐稻飞虱、稻纵卷叶螟等病虫不断蔓延,其发生面积大、危害广,已成为水稻持续增产的一大障碍。为此,必须采取措施加以解决。一、主要病虫发生动态水稻白叶枯病是细菌性病害,主要危害水稻叶片。病菌从叶片水孔侵入,先从叶尖、叶缘或叶脉出现白色条状病斑,发病部与其健全处交界明显,绿白分明。在潮时,病部常溢出 Rice is a major cash crop and its cultivation area is large. The output of rice directly determines whether or not the agricultural production will increase in the whole year. Over the years, pests such as bacterial leaf blight, sheath blight, rice stem borer, brown planthopper, rice leafroller and other pests continue to spread, its occurrence area is large, endangering a wide range, has become a large continuous increase of rice obstacle. Therefore, we must take measures to solve it. First, the main occurrence of pests and diseases Rice bacterial blight is a bacterial disease, the main damage to rice leaves. Pathogens invade from the leaves of water holes, first from the tip, leaf margin or vein white stripe lesions appear, Department of disease and its sound Department at the junction of clear green and white. In the tide, the disease often overflows