Apple trees often have rot. Because the roots were buried in the soil, early infections and illnesses were light, they were not discovered or diagnosed and were not diagnosed correctly. They were not able to treat the disease as they were, but the trees were thin, the yield and character were reduced, and the plants died. Destroyed once. The roots of apple rot are all excessively rainy in the growing season, excessive water in the soil, poor drainage, soil compaction, low organic matter content, and acid or slightly acidic soils are the most serious orchards. They are too deep or too thick to be cultivated, and are damaged when cultivated. Earthworms and other underground pests bite the root system and are prone to develop and aggravate the disease. Its prevention and control methods are:
Strengthen cultivation management and discover adverse conditions
Do a good job of drainage: Before the onset of the rainy season, dig up the drainage ditch, eliminate water and excessive water in a timely manner, reduce groundwater level and soil moisture content, and avoid water accumulation.
Overturning fertilization: From September to October after fruit harvesting, deep-turning orchards, basal fertilization, complete use of various fertilizers, farmer's manure and green manure with a large amount of organic matter, and the improvement of the soil with poor compaction as fluffy and fertile soil as soon as possible Improve water, fertilizer and gas heat in the rhizosphere. Create good growth conditions for the root system.
Increase the use of lime: soil acidity of the orchard, in the growing season, linked to cultivator weeding, increase the appropriate amount of lime, the PH value is adjusted to 6.5 or more, in order to improve the physical and chemical properties of the soil.
Reasonable load: trees with excessive flowers and trees need to do sparse and fruit thinning, and cultivate carefully to protect the roots and root necks from damage, in order to reduce the entry of pathogenic bacteria and strengthen disease resistance. No hedgehogs are planted around the orchard, and the planted species should be removed.
Resolve diseased plants in time to avoid the spread of diseases
Ditching: When the first-seeing diseased plant or diseased plant is rejected, the deep ditch is rejected immediately under the drip line around the diseased plant, and a 5 Baume degree lime sulfur agent is poured to prevent the diseased root from contacting with the roots of neighboring fruit trees to prevent the disease from spreading. .
Clearing the roots: Dismantling tree discs for soil inspection, with severe disease, sawing and destroying large roots, scraping the diseased area, eroding the cortex and wood, and destroying the net and concentrated destruction. After scraping the diseased area and around the soil, pour 5 bourmeite lime sulfur mixture, dry and then apply 2-4 times the rot in the disease department rot be clear, for disinfection and treatment; such as the rainy season, should take the opportunity to air 15-20 days , and then cover it with disease-free soil.
By changing roots: After the roots have been sterilized, three roots with well-developed and vigorously rooted roots are planted along the stems of the roots. After survival, the roots of the new rootstocks are used to connect to the roots. To replace the function of the old rootstock to rescue dying plants and promote restoration of tree vigor.
Timely top-dressing: trees with large roots are eroded in the disease period because they seriously affect the absorption, transportation, and exchange of nutrients, resulting in insufficient nutrient of the tree. Therefore, a 300-fold compound fertilizer solution should be sprayed in time and the new roots should be sprayed. During the growth, topdressing human feces and urine water and appropriate amount of superphosphate were applied to compensate for nutrients and promote new root growth.
The rot disease of fruit trees also damages fruit trees such as pears, peaches, plums, cherries, and chestnuts. The onset, symptoms, and regularity of disease are similar to those of apples, and can be prevented and treated with the same method. An orchard with a large number of underground pests, such as earthworms, should be killed in the mud during the occurrence period.
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