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【单选题】
下列症状属于十字花科蔬菜菌核病的是A.
苗期心脉或沿脉失绿,后产生浓淡不均的绿色斑驳或花叶。
B.
在高湿条件下病部表面条出白色棉絮状菌丝体和黑色菌核。
C.
初期病斑呈半透明、水渍状,后变褐色,组织粘滑腐烂。
D.
空气潮湿时,在叶背面布满白色至灰色稀疏霉层。
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