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Valsa canker,caused by the fungus Valsa mali, isone ofthe most destructivediseases of applein the primary production areas of China.Currently there are no effective control methods for this disease.We investigatedthe occurrence of Valsa canker in apple orchardsin ShaanxiProvincein concert with foliar nutrient analysis, and found that there was a significant negative correlation of leaf potassium (K)content with incidence and severity ofValsa canker.