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期 刊 ：植物保护学报 1998年

关键词：苹果树；腐烂病；钾；相关性；防治；

Keywords:Valsa ceratosperma, potassium content in bark, correlation, disease man-agement,

摘 要 ：在辽西地区国光苹果大树园，完善腐烂病树病情分级标准，适当增加样本数，将生长期叶分枝改为春季发芽前树皮分析，研究发现，树皮中含钾量与腐烂病发生程度之间呈极显著负相关，经初步验证，结果一致，矫治试验结果表明，春季增施钾肥，可提高树皮含钾量并减轻腐烂病发生程度。

Abstract:It was revealed in an extensive survey that the occurrence of apple Valsa canker (Valsa ceratosperma) is correlated negatively with potassium content in bark. The method of disease rating was modified. The assay of potassium content in leaf in growing sea

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