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细菌性病害致豆叶密生褐斑
据有关资料介绍,危害大豆叶片的细菌性病害主要有细菌性斑点病和细菌性斑疹病两种。细菌性斑点病最初在叶片上形成水渍状斑点,以后变成褐色或黑色多角形斑,边缘有黄绿色晕圈,发病组织易脱落,病叶呈破碎状。细菌性斑疹病症状与斑点病相似 ...
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