Eucalyptus is an important species of landscaping and is commonly used in urban street trees and garden greening. It is an elegant tree, green leaves, evergreen, much loved by people. However, it is sour and alkali-fighting and has poor cold resistance and is vulnerable to pests and diseases. Yellowing disease is a common disease of eucalyptus. Yellowing disease, also known as chlorosis, is a physiological disease. Eucalyptus is a kind of acidic and acidic seedlings. If it grows in alkaline soil for a long time, it will affect the absorption of iron and other trace elements in its roots and make the leaves turn yellow and white. Therefore, eucalyptus yellowing disease is also a manifestation of iron deficiency in eucalyptus. At the same time, the lack of nutrients in the soil, poor root development, or improper application of chemical fertilizers and pesticides can also affect the absorption of iron by eucalyptus and accelerate the occurrence of yellowing disease. Eucalyptus yellowing disease manifests itself in the fact that the leaf color changes from green to yellow and thin, the leaves have milky white spots, the veins are very fine green, and when the leaves are severe, the leaves are pale and the leaves are partially necrotic. At the beginning of the eucalyptus tree, the new leaf is more serious than the old leaf, and it is even worse in winter and spring than in summer. After the disease occurs, the pH of the soil around the eucalyptus should be changed to increase the content of iron in the leaves. Some sulphur powder can be applied to the soil, perfusion of 1:20 ferrous sulfate solution per hole around the roots, trunk injection of 15 g of ferrous sulphate, 50 g of urea, 5 g of magnesium sulfate, 1000 ml of water mixture, foliar Spray 0.1 to 0.2% ferrous sulfate solution.
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