The fruit cracking, sunburn and umbilical yellow of navel orange are the three major physiological diseases, and many beginners lack experience in prevention and treatment. After many years of experimentation, the author has accumulated rich experience in the prevention and treatment of fruit cracking, sunburn and navel yellow of the navel orange and effectively controlled the occurrence of diseases. The introduction is as follows, for local reference: First, the cracking fruit disease First of all, to select varieties (lines) with strong resistance to cracking, generally the fruit type oval, umbilical small or closed umbilical varieties (lines) have better crack resistance, such as Newhall; etc.; secondly, Strengthen scientific management, increase tree vigor, especially in the dry period before the arrival of the autumn rain after the rainy season, we must particularly do a good job of water management, so that timely irrigation or pouring (spray) water, often keep the soil moist and promote the normal growth and development of fruit. Again, spray the leaves with potassium fertilizer 2-3 times during the rapid expansion of the fruit. Foliar potassium fertilizer can use 0.2% potassium dihydrogen phosphate or 0.3% potassium sulfate compound fertilizer, and in the first half of July with a concentration of 200 mg / liter of "jijiu" plus thiophanate-methyl 800 times and amount The mixture of incense paste can heal the cracks and prevent cracks from recurring. Second, sunburn to strengthen scientific management, orchards cover straw and other security is the basis for prevention of sunburn; orchard planting grass or intercropping green manure can reduce sunburn; in the hot season, do not spray oil emulsion and lime sulfur Pesticides, so as not to increase the incidence of sunburn. In the early stage of sunburn, stick with white paper on the surface of the sunburst fruit, and pull the leaves to cover the fruit to reduce direct sunlight. Regular irrigation or water spraying in summer and autumn hot seasons can prevent and reduce the occurrence of sunburn. Third, umbilical yellow disease First of all, from the cultivation of vigorous growth of the tree vigor, appropriate increase in nitrogen fertilizer, improve the tree nutrition; Second, before the flowering in the strong prosperous autumn to pull into a sagging or horizontal state, so that the vast majority of flowers open upside down , reduce the sunny fruit, prevent the production of umbilicus; again in the middle of June to late July combined with fruit, spray 30-40 mg / liter of "9 O" liquid, even spray twice, in late July By the end of August, 600 times of "Yellowing Ester" solution was used to spray the umbilical part of the fruit to suppress the occurrence and spread of umbilical yellow disease.
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Navel Orange Disease Prevention and Control Measures