西红柿早疫病发病后叶面具同心轮纹状病斑,暗褐色,水渍状。茎和叶柄、果实等发病后也有同心轮纹病斑,潮湿时病斑上有黑色霉状物。发病前后可用70%代森锰锌可湿性粉剂500倍稀释液,或75%百菌清可湿性粉剂400倍稀释液喷雾,每7天1次,连喷3~4次。 |
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