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There are three main reasons for the occurrence of fruit tree re-disease: First, the root exudates of old fruit trees contain toxic substances, which directly inhibit the respiration of newly planted fruit tree roots, eventually leading to the death of newly planted fruit tree root lesions; second, in old orchard soils. The nematodes and pathogenic microorganisms are more, and the damage to the roots of newly planted fruit trees is greater. Third, some nutrients in the old orchards are seriously lacking or accumulate, and the nutrition structure is seriously out of balance.
The methods for controlling fruit tree replantation are:
1, implement round planting. The most crucial point in the transformation of an orchard is to insist on not planting crops. In addition, new varieties of fruit trees should be selected with good adaptability and strong disease resistance.
2, disinfection and harm. Disinfect the soil in the hole or the cultivation ditch with 37% formalin, then cover the mulch to kill the vast majority of nematodes and pathogenic microorganisms that remain in the soil.
3, deep flip change soil. Before planting new fruit trees, after cutting down all the old trees, the whole orchard soil must be deep-turned, especially the soil in the planting hole. After deep plunge, fill in new soil suitable for fruit tree growth and then plant fruit trees.
4, inoculated with fungi. The inoculation of mycorrhizal fungi in the rhizosphere of newly planted fruit trees can not only greatly reduce the damage of fruit tree replantation diseases, but also significantly promote the growth and development of fruit trees. In areas not inoculated with mycorrhizal fungi, leguminous plants such as soybeans, mung beans, clover and alfalfa can also be planted before the orchard is transformed. These plants are hosts of mycorrhizal fungi and can produce large amounts of mycorrhizal fungi in the soil. , can also fix nitrogen, increase soil fertility.
5, supplement nutrition. Before replanting new fruit trees in the old orchards, it is best to ask the local agro-technical departments to sample and analyze the soil and master the loss or accumulation of nutrients in the orchard soil. Then determine the fertilization plan and add and adjust the soil according to the type and variety of the newly planted fruit trees. The nutrient elements in the special attention should be paid to the application of trace elements and organic fertilizers to ensure that the newly planted fruit trees can obtain the nutrients needed for growth and development.
Winter orchard must be protected
Winter is a good time to reconstruct an old orchard. However, if we ignore the prevention and control of the disease, the newly planted fruit trees will have low survival rate, few fruiting plants, poor fruit quality, and aging of tree vigor.