果树黄叶病是由于缺铁引起的生理病害,发病多从新梢上的嫩叶开始,叶片逐渐变黄。但叶脉仍保持绿色,以后全株大部分叶片除中脉和少数主脉外都变为黄绿至黄白色,严重时枯焦脱落,一般盐碱土或石灰质过高的果园易发生黄叶病,可采用下列方法进行防治:1.改良果园土壤性状。春季果园行间种植毛苕子或野豌豆等绿肥作物,盛花期割掉后翻入土中,秋季再增施一次有机肥。2.控制灌水次数和灌水量。大树一般每年灌4～5 Fruit tree yellow leaf disease is due to iron deficiency caused by physiological diseases, the incidence of young shoots from the young leaves began to turn yellow leaves. However, the veins remained green, after which most of the leaves of the whole plant became yellowish green to yellowish white except for the midrib and a few of the main veins. In severe cases, the kiwifruit shed off. Generally, The following methods to control: 1 orchard soil properties. Spring orchards planted between rows of hairy prunes or wild peas and other green manure crops, cut into the soil after the full flowering season, another application of organic fertilizer in autumn. 2. Control the number of irrigation and irrigation. Large trees generally irrigation 4 to 5 per year