Prevention and Control of rotten Roots of Apple trees growing Apple

Rotten roots often occur in apple trees. Because the root system is buried in the soil, when the first infection and mild infection are not found or found, they are not diagnosed accurately and cannot be treated properly, which causes the tree to be thin, the yield and character to decline, and the plant to die, or even the whole garden to be destroyed. The rotten roots of apple trees are all caused by too much Rain Water in the growing period, too much water in the soil, poor drainage, soil consolidation, less organic matter, acidic and slightly acidic soil, the most serious orchards, too deep planting or too thick soil, damage during tillage or underground pests such as grubs bite the root system, which is easy to occur and aggravate the disease. The prevention and control methods are as follows:

First, strengthen cultivation management and find unfavorable conditions for the disease.

⑴ do a good job of drainage before the rainy season, dig a good drainage ditch, timely eliminate stagnant water and excessive water, lower the groundwater level and soil water content, and avoid stagnant water and waterlogged roots.

From September to October after fruit harvest, ⑵ turned the orchard deeply into the orchard and re-applied base fertilizer, which contained farm manure and green manure with a wide range of elements, and improved the consolidated barren soil into fluffy and fertile soil as soon as possible, so as to improve the water, fertilizer, gas and heat of the soil in the rhizosphere. Create good growth conditions for the root system.

In the orchard with sour lime soil added by ⑶, in the growing season, the combination of ploughing and weeding, adding appropriate amount of lime, adjusting the pH value to more than 6.5, in order to improve the physical and chemical properties of the soil, the discovery is not conducive to the environment for the occurrence of the above-mentioned diseases.

Trees with too many flowers and fruits reasonably loaded with ⑷ should do a good job of thinning flowers and fruits, and cultivate them carefully to protect their roots and necks from damage, so as to reduce the entry of pathogens into the road and strengthen the ability of disease resistance. Robinia pseudoacacia is not planted around the orchard, and those that have already been planted should be cut down.

Second, solve the diseased plant in time to avoid the spread of the disease

When ⑴ trench rejects new diseased plants or few diseased plants, immediately open a deep trench under the dripping line around diseased plants, and pour 5 Baomedu stone sulfur mixture to avoid contact between diseased roots and healthy roots of nearby fruit trees and prevent the spread of diseases.

⑵ root cleaning disinfection planing tree plate soil examination, the disease is serious, saw completely eroded roots, scraping the eroded skin and wood, cleaning and centralized destruction. After scraping, the diseased part and the surrounding soil are poured with 5 Baomedo stone sulphur mixture, and after drying, the disinfection and treatment are carried out. If it is in the rainy season, take advantage of the opportunity to dry the root for 15 minutes and then cover it with germ-free soil.

⑶ is much eroded by replacing big roots. after root cleaning and disinfection, three rootstocks with well-developed root systems are planted in a triangle along the backbone feet. After survival, the rootstocks are connected to the backbone with "grafting", and the roots of the new rootstocks are used to replace the functions of the old rootstocks, so as to save the dying plants and improve the restoration of trees.

⑷ topdressing trees with large and eroded roots in time, because it seriously affects the absorption, transport and exchange of nutrients, resulting in a lack of nutrients, so after the above solutions, we should spray 300x compound fertilizer solution in time, and topdressing once mature human and animal feces and urine and appropriate amount of superphosphate during the growth of new roots, in order to make up for nutrients and promote new root growth.

These diseases also damage pear, peach, plum, cherry and chestnut and other fruit trees, the onset period, symptoms and occurrence regularity, are more or less the same as apples, and can be controlled by the same method. Orchards with a large number of underground pests such as grubs should be poisoned in the soil during the occurrence period, or irrigated with 2.5% deltamethrin and 1000 times water.