1、 The reason why the leaves have yellow spots

1. Soil discomfort: yellow spots on its leaves are mostly caused by yellow leaf disease, which is usually caused by soil iron deficiency. The soil contains a lot of calcium carbonate, which makes the soluble iron salt become insoluble, so its root system can not absorb normally. In the long run, the physiological state is unbalanced, and this disease is easy to occur

2. Improper fertilization: it may also be caused by improper fertilization at ordinary times. The applied fertilizer has not been decomposed, such as chicken manure, sheep manure, etc., which is also prone to yellow leaf disease. Be especially careful when applying fertilizer, and do not use raw fertilizer

3. Lack of water: during the growth period, it is inseparable from water. If the soil is dry for a long time, the root cannot absorb water and cannot normally provide water to the branches and leaves, yellow leaves are easy to appear. Especially new seedlings or plants with floating roots

2、 Prevention and control measures

This disease should be controlled in advance. Before setting the value, the ditch should be opened for irrigation, and the soil should be washed with alkali and salt. Apply the organic fertilizer after ripening once a year after the results. It is recommended to bury the soil after autumn and before winter. Compound fertilizer should be applied regularly during growth to ensure that its nutrients are sufficient and there can be no lack of nutrients. In addition, if yellow leaf disease is found, the drug should be sprayed as soon as possible. The drug can be mixed with ferrous sulfate and citric acid. Spray every 7-10 days. Spraying is best carried out on a cloudy day to avoid the hot sun