一、黄叶病和小叶病这两种都属于生理性病害,是缺少某种微量元素使叶片正常生理活动受阻。其表现形式是新梢或顶端发病,导致叶缘枯焦,多发在石灰质土壤和盐渍土上,土壤粘重积水,发病率就高。它们的区别是:黄叶病是由缺铁引起,最先表现在新生叶片的失绿变 First, leaf disease and leaf disease Both are physiological diseases, is the lack of certain trace elements so that the normal physiological activities blocked. Its manifestations are the tip of the shoot or the top, leading to leaf edge Kujiao, multiple in calcareous soil and saline soil, the soil sticky heavy water, the incidence is high. Their difference is: yellow leaf disease is caused by iron deficiency, the first manifestation of the new green leaf loss