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苹果树因铁营养失调而引起的黄叶病(失绿病),在我省朝阳地区发生较为普遍,病重园发病率达30～50%。在盘山、大洼、金县、黑山、锦县等地亦有发生。除苹果树外,山楂、梨、葡萄等树种上均有发病。一般在苗期和5年生以下的幼树上发病较重,如喀左县小城子村4年生苹果树发病率为30～50%;锦县原种场苗圃中的苹果、山楂树苗有几万株发病,病株率高达90%。为寻求苹果树缺铁营养诊断指标和防治黄叶病的简单易行、经济有效的方法,我们在借
Apple tree due to iron nutrition disorder caused by yellow leaf disease (chlorosis), occurred in our province Chaoyang area is more common, the incidence of severe Park 30 ~ 50%. In Panshan, Dawa, Jin County, Montenegro, Jin County and other places have also occurred. In addition to apple trees, hawthorn, pears, grapes and other species are on the incidence. Generally in the seedling and 5-year-old saplings heavier incidence, such as Kazak small village 4-year-old apple tree incidence of 30 to 50%; Jinxian original seedling nursery apple, hawthorn seedlings have tens of thousands Strain, the strain rate as high as 90%. In order to find an indicator of iron deficiency in apple tree and a simple and cost-effective method to control yellow leaf disease,