First, the performance of different symptoms (a) fruit mosaic disease is a viral disease, leaves showing various types of mottled. The typical condition is yellowing along the veins of the leaves and the rest is still green. When the disease was light, the leaves had scattered yellowish or yellowish-white sporadic spotted spots that did not form necrotic spots; when the onset was severe, discoloration occurred along the veins and white or yellow-white necrotic spots appeared, among which the veins were most discolored. The leaves showed a yellow reticular pattern; when the morbidity was severe, the whole leaf became a yellow-green variegated spot, discolored along the veins, and plaques were necrotic, with large plaques predominating. (b) Yellow leaf disease in fruit trees is a physiological disease caused by the lack of iron in plant tissues. The symptoms are yellowing from the top of new shoots of fruit trees, and the lower the branches, the lighter the yellow leaves of old leaves. When the iron deficiency is slight, the leaves of the leaves turn yellow, the veins on both sides are still green, showing a green reticular pattern; when the iron deficiency is serious, the leaves lose green and become white, and rust brown spots or leaf margins appear in the green part. Become drier and cause fallen leaves. Second, the pathogenesis is different (a) fruit mosaic virus exists in the fruit tree roots, branches, flowers, leaves, fruits, destroy the normal metabolism of fruit tree internal organization, resulting in its nutrients and energy synthesis of viral proteins and nucleic acids, As a result, the normal formation of proteins and nucleic acids in the plant tissue is affected, and the diseased plant tissue appears. (b) Yellow leaf disease in fruit trees is due to the conversion of soluble divalent iron in the soil into insoluble trivalent iron precipitates, which causes iron deficiency in the fruit tree tissues, thereby 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. Third, the control method is different (a) fruit mosaic. In production, an effective prevention method is to use disease-free rootstocks and scion to propagate seedlings, timely excavate diseased plants in the nursery, strengthen fertilizer and water management, increase organic fertilizers, and increase tree vigor. (b) Yellow leaf disease in fruit trees. Pay attention to increase organic fertilizer to improve the soil, pressure alkali resistance drought, timely drainage, before the germination of each plant 100 to 150 grams of ferrous sulfate; spraying leaves 0.3% to 0.5% of ferrous sulfate solution or amino iron 300 times each time, the control effect is good. Natural Oxymatrine,Oxymatrine Extract,Cas 16837-52-8,Natural Oxymatrine Extract Shaanxi The River Pharmaceutical Co., Ltd. , https://www.dahepharma.com