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一、病情简介近年来，我区部分苹果、李子树发生黄化病，发病株率为20％～4啊失绿果树与同龄健树相比较，产量下降10％～30％，致使树势减弱，生长缓慢。黄化病是由于缺铁而造成的一种生理性病害。由于缺铁，前期叶片黄绿，减弱了光合作用，后期叶片由黄变褐枯死，失去光合能力
First, the disease profile In recent years, some apple trees in our region, yellow tree disease occurs, plum trees, the incidence rate of 20% ~ 4 Ah green tree compared with the same age-matched trees, the output decreased by 10% to 30% Slow growth. Yellowing disease is a physiological disease caused by iron deficiency. As a result of iron deficiency, the early leaves of yellow-green, weakened photosynthesis, the late leaf from brown to brown, loss of photosynthetic capacity