近年来,朝阳和盘锦地区新发展的果园,苹果黄叶病有逐渐加重的趋势.发病先从幼嫩的叶片开始,轻者叶脉绿,叶片呈黄斑状黄绿;重者叶片嫩黄,日灼焦干,新梢纤细,芽子干瘪,一、二年后树体因饥饿而死亡.分析原因,主要是由于树体内缺乏铁元素而引起的生理病害. In recent years, the newly developed apple orchards in Chaoyang and Panjin have a gradual increase in yellow leaf disease.The incidence begins with the young leaves, the light leaves are green and the leaves are yellow-greenish yellowish-yellow; the heavy yellow leaves and sunburn Coke dry, thin shoots, shoots shriveled, one or two years after the tree died of hunger.Analysis of the reasons, mainly due to the lack of iron in the body caused by physiological diseases.