Hello! Judging from the picture of withered cherry leaves you sent, it may be iron deficiency. The mobility of iron in fruit trees is very small, and the iron in old leaves can not be transferred to new tissues, so it can not be reused. Therefore, when iron is deficient, the lower leaves tend to remain green, while the young leaves lose their green.

Iron deficiency correction method:

1. Apply organic fertilizer in autumn (around August 20th). At the same time of applying base fertilizer in autumn, 0.5 kg of ferrous sulfate and 20 kg of livestock manure are directly applied to each soil. The lack of iron in fruit trees is not entirely due to the lack of iron in soil. Poor soil structure also limits the absorption and utilization of iron by roots. Therefore, in order to improve the availability of iron in soil, we should first apply more organic fertilizers to improve the soil.

2. Spraying 0.3% ferrous sulfate aqueous solution or chelated iron (ferric citrate) aqueous solution 1 time every half month, spraying * * * 3 ~ 4 times, the effect is good.