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(2) Digging trench isolation and disease prevention: For purple feather disease, white feather disease and root decay disease, when the diseased plant is first seen in the orchard, a deep trench of more than 1 meter should be dug around the diseased plant to prevent it. The disease spreads. Purple feather disease is often transmitted to the orchard through the root of a hedgehog. Therefore, an orchard with a hedgehog used as a protective forest is required to dig trenches around and block entrance to prevent the root from entering and completely dig nettle roots that have entered the orchard. In the new orchard, host trees such as hedgehogs are not used as shelter forests.
(3) Treatment of diseased plants and soil disinfection: After diseased plants are found, they should be treated according to different diseases. For dermatophytosis, the root and neck lesions should be completely scraped off, then the wounds should be disinfected with 402 antibacterial agent 50 times or 1% copper sulfate solution, then coated with Bordeaux fluid protection agent, and the soil around the diseased root should be disinfected .
For purple feather disease, white feather disease, and root decay disease, it is necessary to remove the roots that are already rotten and then disinfect the soil around the root. The diseased tissue that is cut or scraped should be brought out of the orchard and replaced with disease-free new soil. The commonly used agents are: 70% pentachloronitrobenzene, mixed with new soil in a ratio of 1:50 to 100, and spread to the surrounding of the diseased root; the dose of each tree is 50-100 grams, and the large tree is 150-300. Grams. Sodium pentachlorophenol 250-300 times, to prevent white peony disease, each tree 15 kg liquid medicine; prevention and treatment of white feather disease and root rot, irrigation 25 kilograms of liquid medicine. Use 70% thiophanate-methyl 500-1000-fold solution or benzene-liter 1000-2000-fold solution to irrigate the soil around the diseased root. The amount of each fluid used is the same as above. Use 50% dexamethasone water 500 times solution or 50% eutectic WP 250-300 times, copper sulfate 100 times, 40% formaldehyde l00 times, etc. Watering the soil, but also have some preventive effect. The application period can be during the dormancy period of fruit trees, or between April and May or September, and should be avoided during the high-temperature period from July to August. Fertilizer should be applied after application to promote the formation of new roots and accelerate the restoration of tree vigor.
(4) Fruit trees that have died or are about to die: They should be excavated as soon as possible, and all remaining roots must be planed and burned. The lesions were soil-sterilized with 40% formaldehyde 100-fold or pentachlorophenol sodium 150-fold.
(5) Bridging and disinfection of seedlings: In the early spring, bridge the new roots in the upper part of the victim's root neck, or plant a strong disease-resistance rootstock next to the diseased tree, and make connections to help restore the tree's vigor. Seedlings should be eliminated from the nursery stock and soaked with a 70% thiophanate-methyl WP wettable 500-fold for 10-30 minutes or in a warm water of 45°C for 20-30 minutes before culturing.
Method for controlling apple rot disease
(1) Strengthen the cultivation and management: The orchards shall timely drain and prevent droughts and floods. Adding organic manure and planting green manures such as wolfberry fruit to improve the soil, increase soil fertility and appropriately increase potassium fertilizer. Timely control of pests and diseases and control of the amount of results, overcome the size of the year, in order to enhance tree vigor and improve the ability of tree disease resistance. When the seedlings are planted, the soil surface should be exposed at the interface to prevent infestation of the white fungus in the soil from the interface.