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分离 - 植物百科_百草大全

西葫芦黑星病有什么主要症状,发病规律如何

该病主要危害叶片、茎及果实。幼叶初现水渍状污点,后扩大为褐色或墨色斑,易穿孔;茎出现椭圆形或纵长凹陷黑斑,中部呈龟裂;幼果初生暗褐色凹陷斑,后发育受阻呈畸形果;果实病斑疮痂
2023-06-19