果树黄叶病除病害外,大多是因缺铁所致。因为铁是绿色素合成中不可缺少的成分,一旦果树缺铁往往会使叶子黄化。果树因缺铁而发生的黄叶病可用埋瓶法防治。具体方法是:早春待树发芽时,在其周围1米处,挖出粗约1厘米左右的树根,将其切断后插入装有0.3～0.5%硫酸亚铁液的瓶中,然后埋好。一般大树可按不同方向埋6～7个,小树埋3～4个,埋入7天后即可见效。 Yellow leaf disease in addition to disease, mostly due to iron deficiency. Because iron is an indispensable ingredient in the synthesis of green pigment, iron deficiency in fruit trees tends to yellow the leaves. Fruit tree due to iron deficiency and yellow leaf disease can be buried bottle prevention. Specific methods are: early spring to be the tree germination, around 1 meters around, dredged about 1 cm rough root, the cut into the 0.3 ~ 0.5% ferrous sulfate solution into the bottle, and then buried . General tree can be buried in different directions 6 to 7, 3 to 4 buried trees, buried in 7 days to bear fruit.