某种营养元素的缺乏可导致果树生长发育不良,严重影响苹果的产量和质量,只有准确的诊断,才能正确地进行防治。 一、缺铁 苹果缺铁可引起黄叶病,这种黄叶症状发生比较普遍,黄叶由嫩叶向老叶发展,随着病情发展,叶片变为白色,导致落叶,新梢顶端 A lack of nutrients can lead to poor growth and development of fruit trees, seriously affecting the yield and quality of apples. Only with accurate diagnosis can we prevent and control diseases properly. First, the iron deficiency in iron-deficiency apple can cause yellow leaf disease, the yellow leaf symptoms occur more commonly, the yellow leaves from the young leaves to the development of the old leaves, with the disease development, the leaves turn white, leading to deciduous, tip top