苹果黄叶病是一种缺铁引起的营养生理病,在盐碱地或石灰质过高地区受害十分严重。病树表现为叶片变黄,但叶脉仍保持绿色。病重时新梢顶端叶片枯焦。防治该病采用泡根法复绿迅速而全面。具体方法是在春季化冻后至果树萌芽期或在秋末落叶前,沿根颈周围挖圆坑,露出大侧根。找出与黄化部位相应的大侧根4—5条,对每一侧根两侧各作 Apple yellow leaf disease is a nutrition and physiology disease caused by iron deficiency, which is very serious in saline-alkali areas or areas with too much lime. The diseased tree showed yellowing of the leaf but the vein remained green. Serious when the tip of fresh shoots dead leaves. Prevention and treatment of the disease using bubble root regain rapid and comprehensive. The specific method is in the spring after the thawing to the fruit tree germination or deciduous leaves before the end of autumn, along the neck around the pit digging pit, exposing a large lateral root. Identify 4-5 large lateral roots corresponding to the yellowing site, each on both sides of each lateral root