1、银杏树病原真菌

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2、YINXINGSHUCHONGHAI

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3、YINXINGSHUQUEFAGUANLI

由缺肥或施肥不合理造成叶片黄化焦枯。缺肥，如缺氮，叶色枯黄，无光泽且叶小。缺磷，老叶变成黄绿相间的花叶状，叶面呈紫色或红色斑。缺钾，轻则新生枝条基部或中部叶片变黄，停长早，叶尖或叶缘呈现褐色枯斑。重则叶缘由外向内焦。缺钙,叶片边缘褐绿或呈现褐色坏死斑点。缺镁，基部叶片褪绿脱落，银杏树苗批发顶梢留有几片薄小的淡绿色或黄褐色叶片。缺硫，幼叶先失绿变黄，而后叶肉渐黄，严重时叶片基部常发生红棕色。

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