1, root rot: root rot is often too much water in the pot, or fertilizer is too thick caused. Will rot the root system excision, thereafter pay attention to drainage, too much rot part, the plant is likely to save not live.
2, malnutrition: the performance of the situation is often a flower, the leaves on the yellow, or even leaf drop. Can be sprayed with potassium dihydrogen phosphate, this fertilizer contains nitrogen, phosphorus and potassium, but also contains a large number of trace elements, the use: foliar spray 0.3%, while the pots of soil, half a month during the growing season.
3, iron deficiency: can add ferrous sulfate in the sprinkled water, the concentration control at about 0.3%.
4, insect pests: insect pests are visible to the naked eye, you can manually get rid of insects, you can also spray the appropriate agents.
In the breeding of lemon trees, its leaves appear shriveled, curled and other obvious dry phenomenon, you can spray water to the foliage, a small amount of water sprayed in the potting soil, so that the lemon always survives in a dry environment, and its axillary buds, on the contrary, increasingly expanded, the buds color from green to white, when most of the axillary buds from green to white, to restore the water supply in a timely manner.