针对甘肃秦安县苹果叶缘焦枯发生严重的情况，对该地果园叶片和土壤进行了分析。
The apple leaf and soil in orchard of Qin ′ an county of Gansu were investigated .
甘肃省秦安县苹果叶缘焦枯死亡原因的初步研究
Preliminary Survey on the Cause of Withered and Die off of Apple Leaf in Qin ` an County of Gansu
秦安苹果