In recent years, with the expansion of the area of ​​fruit trees, there are more and more plants that exhibit fruit mosaic disease, especially some mature trees. In terms of production, many growers mistakenly thought that it was yellow leaf disease caused by iron deficiency. Giving ferrous sulfate was not only ineffective, but also caused some undue economic losses. In fact, fruit mosaic disease and yellow leaf disease are fundamentally different and are two distinct diseases. (I) Symptoms are different: Fruit mosaic disease is a viral disease, and leaves show various types of mottled appearance. Typical lesions spread along the veins and turn green and yellow, with the rest still green. When the disease was mild, scattered yellowish-white or yellowish-white sporadic spotted leaves did not form necrotic spots; when the onset was severe, discoloration occurred along the veins and white or yellowish-white necrotic patches appeared, among which discoloration occurred along the veins. Obviously, the leaves are yellow netted; when the disease is severe, the whole leaf becomes a yellow-green piebald spot, discolored along the veins, and the plaques are necrotic, with large plaques accounting for the majority, occurring in summer, and falling early. Yellow leaf disease in fruit trees is a physiological disease caused by the lack of iron in plant tissues. Its characteristic is that the yellow leaves begin from the top leaves of the new shoots, and the lighter the old leaves are, the more they move toward the lower ends of the branch nodes. After the leaves were damaged, the yellow leaves were yellow and the veins on both sides were still green, so it was green netted. In severe cases, the leaves become chlorogenic and become white, and rust-brown spots or leaf margins are dying in the green part, causing defoliation. (B) The pathogenesis is different: (1) Mosaic of fruit trees: Viruses are found in the roots, branches, flowers, leaves, and fruits of fruit trees, destroying the normal metabolism of the internal tissues of fruit trees, causing the nutrients and energy to synthesize proteins of viruses, respectively. And nucleic acids, thus affecting the normal formation of proteins and nucleic acids within the plant tissues, causing the diseased plant tissues. (2) Yellow leaf disease in fruit: It is due to the conversion of soluble divalent iron in the soil into insoluble trivalent iron precipitates, which causes iron deficiency in the plant tissues, thus affecting the formation of chlorophyll and chlorosis of the leaves. At this time as long as the timely addition of soluble divalent iron, the symptoms will soon disappear. (III) Different prevention and control methods: (1) Mosaic virus: At present, no effective pharmaceutical agent has been developed in the world to treat it. Conventional bactericides are not effective against it. In production, an effective prevention method is to use disease-free rootstocks and scion to propagate nursery stock, timely excavate diseased plants in the nursery, strengthen fertilizer and water management, increase organic fertilizer, and strengthen tree vigor. (2) Yellow leaves of plants caused by iron deficiency: Just pay attention to the application of organic fertilizers to improve the soil, press the alkali to fight the drought, drain the worms in time, apply 100-150 grams of ferrous sulfate per plant before germination, and spray 0.3-0.5 on the young leaves. % of ferrous sulfate or 300 times the number of amino acid iron, control effect is very good.

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