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在生产上,水稻叶部病害较多,农户经常把水稻叶部病害常常混淆不清,为了更好认别水稻叶病害及有效的防治,现将水稻叶部病症状认别如下,更好采取有效防治措施。1.水稻胡麻斑水稻各生育期都可产生稻株,但以叶片发病为主,其次为穗部、叶部,最初为褐色小点,后扩大成褐色至暗褐色圆形病斑似芝麻粒状。病斑中部黄色或灰色,边缘褐色,外围黄色晕环,两端钝圆型,但无沿叶缘延伸的坏死线(稻瘟病),据此可与胡麻斑加以区别,此为小斑型病斑,病斑大小、色泽常因环境或品种不同而有差异,环境适合则产生上述症状,在每片上病斑很多时常相互融合成不规则形大斑,使叶片提早枯死,当稻株缺钾时,病斑较大,略呈棱形,病斑上轮纹明显,此类病斑为大斑型病斑。
In the production of rice leaf disease more, farmers often leaves of rice leaf disease often confused, in order to better identify rice leaf disease and effective prevention and control, now the rice leaf disease identified as follows, better to take Effective prevention and treatment measures. Rice paddy rice paddy rice during each growth stage can produce rice plants, but leaves the main disease, followed by the spike, leaf, initially brown dots, then expanded to brown to dark brown round spot like sesame seeds . Lesions central yellow or gray, brown edge, peripheral yellow halo, blunt round at both ends, but no necrosis along the edge of the line extending along the leaves (rice blast), which can be distinguished from flax spots, which is a small plaque disease Spot, lesion size, color often due to different environments or varieties are different, the environment is suitable for the above symptoms occur in each piece of a lot of spots often merged into irregular shaped spots, the leaves die early, when the rice plants potassium deficiency When the lesion larger, slightly prismatic, lesions on the wheel pattern is obvious, such a large spot for the lesion spot.