Prevention of apple leaflet disease

The lack of ingredients triggers the prevention and treatment of leaflets. The lobular disease caused by zinc deficiency is mainly controlled through soil improvement and zinc supplementation. The main measures are: 1 increase organic fertilizer. Improve soil, strengthen soil and water conservation, and increase tree vigor. 2 combined with autumn fertilization, supplement zinc fertilizer. Autumn mature tree strain 0.5-1 kg of zinc sulfate applied. 3 ways to supplement zinc fertilizer. In early spring, the tree was sprayed with 3% zinc sulfate + 3% urea solution on the main trunk before germination. In addition, 2-5% zinc sulfate solution can also be applied before germination, 1% zinc sulfate can be sprayed when flower buds are red, 0.2% zinc sulfate and 0.3% urea solution are sprayed during apple flowering period, and 0.2% sulfuric acid is used 3 weeks after flowering. Zinc +0.3% urea solution. Unreasonable pruning causes the prevention of leaflets. For the lobular disease caused by unreasonable pruning, the following measures are mainly adopted to prevent and control: 1 Correctly select the cut kerf, avoid mouth-to-mouth injury, even oral injury, and remove excessively thick branches at one time. When excessive branches are removed, the method of retaining the pile or dumping the small mortar may be adopted, and the thickness may be removed in 2-3 years, and a 3% zinc sulfate solution may be applied to the saw blade before wound protection measures are taken. 2 When pruning the trees that have caused lobular disease due to improper trimming, use light scissors as the main method. Four seasons combined pruning method is adopted to slowly put twigs of lobular disease, which can not be shortened, and comprehensive management is strengthened. After the 2-3 year branches return to normal, they can be pruned by conventional methods, and can also be refreshed by strong twigs that sprout at the rear. . (3) For trees that are heavily circumscribed and the joints are not healed well, bridging between the upper and lower sides of the escaping is required, and the poorly-sealed excision is tightly wrapped with a plastic film. 4 It is necessary to strictly control the load of the tree and maintain a robust tree vigor.

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