Apple trees often have rotten roots. Because the root system is buried in the soil, when it is firstly infected and infected, it is not diagnosed or found to be accurate and cannot be treated with the right medicine. It causes the tree to be thin, the yield and character are reduced, and the plant is dead, even the whole garden. Destroyed once. The rotten roots of apple trees are excessive rain in the growing season, excessive water in the soil, poor drainage, soil compaction, less organic matter, and the orchard of acidic and slightly acidic soils is the heaviest, the planting is too deep or the soil is too thick, and the damage is caused by farming or Underground pests such as cockroaches bite the roots, prone to increase and aggravate the disease. The prevention method is:
First, strengthen cultivation management and find adverse conditions
(1) Do a good job before draining the rainy season, dug the drainage ditch, timely dispel the accumulated water and excessive water, reduce the groundwater level and soil moisture content, and avoid water accumulation.
⑵ turn Park fertilization after fruit picking 9 --10 months, deep plowing orchards, heavy Fertilizers, fertilizers complete multi-element, multi-containing organic manure and manure, the barren soil compaction fluffy modified into fertile soil as soon as possible, so that Improve the water, fertilizer, gas and heat of the rhizosphere soil. Good growth conditions are invented for the root system.
(3) Increasing the orchard with lime soil, in the growing season, connecting cultivating and weeding, adding appropriate amount of lime, and adjusting the pH to above 6.5 to improve the physical and chemical properties of the soil, and the invention is not conducive to the environment in which the above diseases occur.
(4) Trees with excessive load of flowers and fruits should be thinned and thinned, and carefully cultivated to protect the roots and roots from damage, so as to reduce the entry of pathogens into the road and strengthen disease resistance. There are no hedgehogs around the orchard, and the species that have been planted should be removed.
Second, timely solve the diseased plants to avoid the spread of disease
(1) When the ditch refuses to see the first diseased plant or the diseased plant is small, immediately refuse to open the deep ditch under the drip line around the diseased plant, and pour 5 waves of sulphur sulphur mixture to prevent the root of the disease from coming into contact with the roots of the neighboring fruit trees to avoid the spread of the disease. .
(2) The roots are cleaned and the trees are checked for soil. The disease is heavy, the saws are completely smashed and the roots are scraped, and the diseased parts are smashed and the wood is removed. Scraping portions and the surrounding soil disease pouring 5 degrees Baume lime sulfur, dry and then brushing portion 2 on the disease --4 times will clear rot, disinfecting and treatment; if coincides with the rainy season, should take the opportunity to dry root 15--20 days Recover with disease-free soil cover.
(3) After the roots and roots are smashed, after rooting and disinfection, the rootstocks of the three roots are developed along the backbone of the bones. After the survival, the roots of the new rootstocks are connected by the "relief". To replace the function of the old rootstock to rescue the dying plants and enhance the recovery of the tree.
â‘· timely fertilizer large number of tree root erosion in sick period, because a serious impact on nutrient absorption, transport and exchange up and down, resulting in insufficient tree nutrient, so after you have finished the above solution, it is timely spraying 1 times 300 times complex liquid fertilizer and livestock manure composting topdressing 1 times the amount of water and superphosphate when new root growth to make up for nutrients and promote new root growth.
These diseases also damage pears, peaches, plums, cherries and chestnuts, etc., the onset period, symptoms and occurrence rules, similar to apples, can be controlled by the same method. Orchards with a large number of underground pests should be poisoned in the soil during the occurrence period, or by using 2.5 % deltamethrin to water 1000 times.
Source: Gansu Science and Technology News Zhang Xiaoxia
Â
Â
Electromagnetic Flowmeter,Magnetic Flow Transmitter,Electromagnetic Water Flow Meter,Flowmeter Electromagnetic
Wuxi Winsun Automation Instrument Co., Ltd , https://www.winsunwx.com