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萝卜叶发黄怎么办

更新时间: 2021-03-25 08:23:06     

1、可能是发生萝卜黑腐病了。这种病害在萝卜幼苗期即可发生,发病后地上部表现为边缘变黄,然后叶脉变黑,从叶缘向内形成V字型或不规则型黄褐色病斑,病菌能沿叶柄发展蔓延到根茎部和根部,使根茎部的维管束变黑,植株叶片枯死,萝卜肉根外部的症状不明显,但切开后可见维管束变黑,严重的内部组织干腐,形成黑色空洞,变为空心。

2、可以采取以下措施进行防治:适时播种,苗期适时浇水,合理蹲苗,及时拔除田间病株并带出田外深埋,并对病穴撒石灰消毒。 如果发病在发病初期及时喷施“天达2116”800倍液+“天达诺杀”1000倍液、72%农用链霉素可溶性粉剂4000倍液、新植霉素4000倍液、47%加瑞农可湿性粉剂800倍液、70%敌克松可溶性粉剂1000倍液等。

关键词: 萝卜 发黄 怎么办

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