Walnut rot disease, also known as walnut rotten disease, walnut blackwater disease, is one of the major diseases of walnut trees. Pathogens of the disease can invade the tree from wounds such as frostbite, sunburn, mechanical injury, trimming and grafting, and cause diseases. Winter cold damage and snowfall will cause freezing damage to young shoots of walnut shoots, which will create conditions for the occurrence of walnut rot. Therefore, prevention and control should be strengthened.
Fertilizer management
For orchards with poor soil structure, infertile soil, and heavy saline soil, the soil should be deep-rooted, soil-fertilized, organic fertilizer added, fertilizer applied at the right time, nitrogenous fertilizer applied, and phosphorus and potassium fertilizers added. Reasonable intercropping and non-wrapping, and walnuts Joint pests such as beans, potatoes, and Chinese herbal medicines, timely irrigation and drainage, improve soil fertility.
Tree Management
1 reasonable trim. Cut off drooping branches, thin and weak branches, dry and dead branches, overlapping branches, cross branches, over dense branches, and disease and insect branches, regulate the contradiction between growth and results, improve ventilation and light transmission conditions, and increase walnut yield, quality, and profit. 2 trunk white. Newly planted saplings should pay more attention to the whitening of trunks to reduce the invasion of pathogens and prevent frost damage of walnut trees. 3 disinfection protection. Regular inspection, timely scraping the lesion into a diamond shape, scraping the mouth should be smooth and smooth, scraping the scope including the discolouration of the phloem and xylem, and about 1 cm around the discolored and necrotic tissue, so that “shave early, scrape, scrapeâ€, scrape Diseases under the disease should be concentrated and burned to avoid human infection. Apply 1 to 2 germicides after scraping to protect the wound and prevent recurrence of the lesion. Can also be used 40% Formamide Astable WP 50 times, or 5-10 Baume Lime sulfur, or 50% thiophanate-methyl WP 100 times, or 50% carbendazim WP 1000 times Disinfection protection.
Garden Management
Orchards must be cultivated and weeded in time, not less than 3 times a year, and the branches, stems, and pests and fruits of the park must be burned to reduce the source of germs.
Chemical control
Apply canopy spray before or at the onset of the disease. Apply 50% carbendazim WP 800 times or 75% chlorothalonil 600X or 50% thiophanate-methyl wettable powder 1000X every 7 days. Spray once, even for 3 times, can achieve better control effect. Http://Content/a0e34cc2-170e-4210-aab2-7ae813e1dca3?cType=2
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