Control of Clivia chlorosis

Orchid yellowing disease is also called chlorosis. The etiolation of Cymbidium is caused by rapid lack of water and iron. The damaged leaves showed milky white patches, or all turned yellowish white, and in severe cases wilted, wrinkled and withered. Orchid yellowing disease has a variety of manifestations: all the leaves turn yellow, which is often a symptom of sunburn disease. Leaves start yellowing from the tip, often because the culture soil is not completely mature, or too much fertilizer and water, resulting in root burning. The yellowing of individual leaves is likely to be the result of fire, cold wind or acid-alkali erosion. Sometimes the whole leaves of Cymbidium turn yellow, mostly because of nutritional deficiency. Another kind of leaf yellowing is caused by lack of light.

Prevention and cure method

In summer, put the magnolia in a shady, cool and ventilated place, and illuminate it with 50% shaded light to prevent the occurrence of sunburn. Orchids must be cultivated with mature, loose, slightly acidic rotten leaf soil. When the temperature exceeds 30 ℃, little or no fertilizer should be applied, and the amount of water should be reduced accordingly to prevent the leaves from yellowing after rotting roots. If it turns yellow, the reason is the lack of nitrogen fertilizer, the breeders can apply cake fertilizer appropriately. At the same time, 0.1-0.2% ferrous sulfate solution can be sprayed on the leaves every day. Strengthen the light in winter, it is best to have a fixed time every day, give the gentleman orchid sunbathing. After such observation and management, yellow disease seldom occurs in Magnolia.