Why does the shoots appear dry during the production of walnuts? In the process of planting walnuts, it is common for walnuts to appear dry, but it has seriously affected the yield of walnuts, which is one of the main limiting factors limiting the production of walnuts. There are many reasons why the shoots in the walnut production will dry up. The details are as follows. 1 Reasons for the dryness of walnut branches 1.1 Variety characteristics There are many varieties of walnuts in China, and the degree of dryness of branches of different varieties of walnuts is different. Strong resistance varieties generally do not occur or rarely occur, and the weak resistance of the branches of the varieties is more serious; early walnuts are easy to draw secondary branches and long branches, such branches are more developed Not full, winter and spring are prone to pumping, leading to dryness. 1.2 Cultivation environment When walnuts are planted on soils with heavy clay, excessive humidity and high groundwater levels, root rot and shoot tips are prone to occur. 1.3 Freezing damage Walnuts are thermophilic species. When the temperature is below 25 degrees, freezing damage will occur. Especially in winter, low temperatures often lead to dryness. 1.4 lighting Walnuts are hi-light species. When planted too densely, the walnut garden will be closed and the light will be poor, and the twigs will dry out easily. 1.5 pest damage Walnut is a kind of non-forest tree species. When intensive cultivation, it forms conditions conducive to the spread of pests and diseases, leading to a large number of rot, black spot, blight, powdery mildew, brown spot, and gibber eggs. Growth is blocked, and when the branch is severe, the branches are dry. 1.6 Improper management In the case of excessive nitrogen application and frequent rainfall in autumn, the branches will stop growing late, the shoot tip maturity will be poor, and the winter frost resistance will be weak, which will easily lead to the phenomenon of two dryness. 2 Prevention measures 2.1 Build a garden Strictly choose the garden site to ensure proper planting, avoiding the occurrence of natural disasters such as freezing damage and mites, and preventing the occurrence of dry shoots during the growth of walnuts; selecting plots with deep soil layers, loose and fertile soil, and low groundwater level. When planting in the mountains, it is better to use the middle and lower southern slopes; choose to avoid the open air and low-lying land to prevent the occurrence of dry shoots in the growth process of walnut trees. 2.2 Select resistant varieties Choose varieties that are resistant to cold and disease resistance; when planting in alpine regions, they should be based on late varieties. 2.3 Reasonable dense planting Reasonable close planting, proper amount of staying branches, ensuring good ventilation and light transmission of walnut garden and tree body, reducing the occurrence of dry shoots; planting should not be too dense, generally 33 plants per mu are planted in the mountain, 22 plants per mu are planted in Sichuan; After a large number of results, it is necessary to strictly control the amount of branches; for the peripheral dense squeezing branches and the cross branches and overlapping branches in the crown, it is necessary to properly retreat and eliminate the branches, and the branches that have had fruit will be weakened and stayed strong. Keep the tree body ventilated and well-transparent to prevent the inner branches from drying out. 2.4 Pest Control Strengthen the prevention and control of pests and diseases, reduce the occurrence of shoots; when there are rot spots, cure and apply the agent in time, or 70% thiophanate-methyl WP 50 times or 45% crystal sulphur 20~30 Double solution for healing; leaf and flowering period, alternately spraying 70% thiophanate-methyl WP 800 times solution, 80% tebuconazole 4000 times solution or 10% difenoconazole 3 000 Double liquid, control black spot, blight, brown spot and powdery mildew, to prevent the branches from dying; timely remove the new shoots of G. sinensis, A. sinensis and A. sinensis in April and May to eliminate larvae and mites In July-August, insecticides such as chlorpyrifos were injected into the wormholes of pests to kill larvae; in the period from June to July, 10% of imidacloprid EC 2000 times or 3% acetamiprid 1500 times was sprayed during adult emergence. Liquid, killing adults to control the damage; spraying 48% of the 2 million times of liquid in the 2 days before the frosting or frosting to prevent the green leafhopper from spawning on the shoots. 2.5 Improve shoot maturity Strengthen cultivation management, enhance anti-freezing ability, reduce the incidence of winter and spring shoots; control the application of nitrogen fertilizer after August, remove the accumulated water in the field after rain, ensure that the new shoots stop at a timely time; for trees that do not stop in time PBO of 600 times solution is sprayed on the body or shoots to prevent the shoots from growing, increasing the accumulation of nutrients in the shoots and reducing the occurrence of dry shoots. After the leaves are frozen, the soil is ploughed before the soil is frozen, the soil physical and chemical properties are improved, and the soil is enhanced. Sexuality can greatly reduce the occurrence of dry shoots. 2.6 Strengthening branch protection in winter and spring Spraying protective agents on the shoots in winter and spring can greatly reduce the occurrence of dry shoots. There are two main measures used in production: 2.6.1 Spraying high-fat film: Spraying high-fat film once every 15 days in February-May can reduce the occurrence of dry shoots. 2.6.2 Spraying lime liquid: Spraying the tree with 5%-10% lime liquid + 10% washing powder at the beginning of February can reduce the occurrence of dry shoots. Peru Squid ,Peru Jumbo Flying Squid,Peru jumbo flying squid Zhoushan Boda Aquatic Products Co.,Ltd , https://www.baida-aquatic.com
