答陕西省商洛地区读者洗明展苹果小叶病是由缺锌引起，修剪时首先应做到少疏大技和带小叶病的枝条，特别应避免疏枝造成对口伤，否则会使小叶现象更加严重，对有小叶病的枝条，必须待后部枝条恢复正常生长后，再逐步疏掉；其次是少短截外围旺枝，因何体缺锌时，生长素的合成减 A reader in Shaanxi Province, Shaanxi Province, wash wash out the exhibition of apple leaf disease is caused by zinc deficiency, pruning should be done less sparse technology and lobular disease branches, in particular, should not be caused by thin branches caused by injury, otherwise it will make leaflet more Serious, lobular disease branches, the back must be back to normal growth after the branches, and then gradually sparse; followed by less short cut peripheral Wang branch, why the lack of zinc, the synthesis of auxin minus