Except for apples, these symptoms are obvious, except that the leaves of apple branches are clustered, narrow and slender, the leaves are still uneven, the internodes of branches are short and cannot be extended, and the newly grown branches are still small. Branches and leaves can't grow normally, there are no buds, and they can't bear fruit. Why do fruit trees have lobular diseases? Lobular disease is mainly due to the large use of chemical fertilizers and the underestimation of the use of organic fertilizers. Symptoms caused by the lack of soil organic matter, soil acidification and the inability of roots to absorb trace elements.

Excessive phosphate fertilizer leads to zinc deficiency in soil. The growth and development of fruit trees need various nutrients, such as nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, iron and zinc. They have a synergistic effect, or they are opposed to each other, or they are unilaterally opposed to each other. In the process of fertilization, fruit farmers should first improve the soil environment and change the concept of fertilization. Not only the application of chemical fertilizer, but also the balanced application of organic fertilizer, trace element fertilizer and biological bacterial fertilizer. If zinc fertilizer and boron fertilizer are applied, it has good effect on controlling apple lobular disease.

In short, lobular disease is a manifestation of zinc deficiency, but you must find out the reason for zinc deficiency yourself. It may be because it is not underground, or it may be that the root system is poor and the supply is insufficient, so it cannot be absorbed or pruned too much. Caused by it. Dig out 0.2-0.3 cm fine roots from one side of the diseased tree and insert them into bottles filled with 150 times of zinc sulfate diluent, with 5-7 bottles for each diseased tree; Fifth, after the new buds germinate. Usually because of zinc deficiency, 35 times zinc sulfate is applied to the buds. When sprouting in spring, the temperature is low, which easily leads to zinc deficiency. With the increase of temperature in the growing period, it will recover. If it is not ideal, please spray zinc sulfate.

Fertilize in spring to increase the amount of zinc sulfate fertilizer, and spray trace element fertilizer containing zinc on the leaves. Spraying a high concentration of nitrogen and zinc fertilizer mixture (1-5%) and bactericide on the dry branches in spring to clean the garden. Fruit trees should be pruned as slowly as possible. Poor root growth of fruit trees leads to insufficient nutrition supply. The main reason is soil hardening and root rot caused by pests and diseases. It can activate soil and prevent diseases and pests, especially in winter.