[Distribution] Alkaline soil areas are prone to occur. [Symptoms] The leaves turn gloomy. They first occur on the branches and young leaves. They begin to fade from the leaf margins to the center of the leaf. The leaf color changes from green to yellow and gradually becomes heavier. The leaves become yellow or light yellow, but the veins are still present. Green; After the whole leaves turn yellow, and then turn yellowish-white, white, the edges of the leaves appear gray-brown to brown, necrosis and dryness; the whole plant suffers the most severe damage to the top leaves, the normal or near-normal leaves of the lower leaves, and the plants with severe disease, year by year. Weak, and finally died. [Pathogen] This disease is caused by unfavorable cultivation conditions, such as excessive soil adhesion, excessive calcareous, alkaline heavy, low phlegm moisture, insufficient supply of ferritin, etc. It is an important physiological disease. [Prevention and Control Methods] (1) Horticultural control: Use well-drained, soft, fertile acidic soil for cultivation. Use acidic soil such as mountain mud for potted plants, change potting soil once every 1-2 years, use organic fertilizer, and use organic fertilizer. Mix ferrous sulphate and zinc sulphate during tanning. (2) Chemical control: In the early stage of disease, the diseased plants should be poured with 2%-3% ferrous sulfate, or sprayed with 0.1% 0.2% ferrous sulfate, or iron integrants in the soil, 22 cm (6 inches). ) Flowerpot 0.2g. Treating yellowing with a medicament should be carried out at the early stage of the disease, otherwise the effect is poor.
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