苹果树黄叶病在我省的大庆、泰来、嫩江地区、齐市一带的果园普遍发生的一种生理性病害。发病后叶上失去叶绿素,不能制造营养,叶子黄白甚至枯焦脱落,抽技力大为减弱。果实瘦小黄白色,产量降低。树势削弱后易感染其他病害,重则整株死亡,因此对果树生产威胁很大。从一九七六年我站与大庆簸箕山果园共同协作摸索其发病规律及防治方法,经过二年的初步调查和试验,初步认为: Apple tree yellow leaf disease in Daqing in our province, Tailai, Nen River area, homogeneous orchard in the common occurrence of a physiological disease. After the onset of the loss of chlorophyll on the leaves, can not create nutrition, leaf yellow or even Kujiao off, pumping skills greatly weakened. Fruit thin yellow-white, lower production. After the weakening of the tree vulnerable to other diseases, but the whole plant died, so the threat to the production of fruit trees. From 1976, I stood in collaboration with Daoyijishan Orchard in Daqing to explore its pathogenesis and prevention methods. After two years of preliminary investigation and experiment, I initially thought: