Apple tree lobular disease, also known as zinc deficiency disease, is mainly characterized by short internodes of new shoots, clustered or bald tips of leaflets, narrow leaves, non-stretching, leaf margins, and spring symptoms. After 2-3 months, the diseased branches were easy to wither and fresh branches were found in the lower part of the diseased branches. The leaves on the new branches were normal at first and then gradually became small or unevenly colored. In serious cases, lobular disease appeared almost entirely on old branches aged 5-6 years. The flower bud differentiation of the diseased tree is hindered, and the flower bud or flower is small and pale, and it is not easy to set fruit or fruit deformity. The roots of diseased trees are stunted, with rot-rooting in the later stages. The severely diseased tree vigor is extremely weak, and the crown does not expand, resulting in reduced yields.
The main cause of lobular disease in apple trees is malnutrition. There are three specific situations to analyze: First, lobular disease occurs in the whole tree or in the whole tree, which is caused by zinc deficiency. The second is the occurrence of lobular disease on the branches, which is caused by improper trimming. It has been observed that lobular disease on local branches is mainly due to excessive wounds on the branches, which results in destruction of the delivery catheter and obstructed passage of nutrient supply. Third, lobular disease often occurs in parts of the rot and dry rot trees.
The situation described by Zhang Xiaobing should be lobular disease caused by zinc deficiency. Zinc supplements should be promptly supplemented. The specific measures are: 1. Spray 3%-5% zinc sulfate solution 10-15 days before apple germination. The lighter disease concentration may be lower, and the disease may have a higher concentration. The year after spraying can be effective, the effective period is generally 1 year. 2. Soil zinc supplementation. Each tree is given 0.5-1 kg of zinc sulfate. It will be effective in the spring and will have an effect in September this year, and it will show a significant effect next year. The effect of applying once can last for several years, but it should not be applied in alkaline soil. 3. In addition to supplementing zinc fertilizer in sandy or barren mountainous orchards, attention should be paid to improving the soil, applying organic fertilizers, and strengthening soil and water conservation.
For lobular diseases caused by pruning in local branches, they should be solved by pruning and adjusting from less sparse cuts, weaker stays, and less scars.
For the lobular disease caused by the diseased tree, the prevention and treatment of diseased trees should be strengthened, and the tree vigor should be weakened and strengthened as soon as possible.
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