Recently, readers of Li County, a reader of Jixian County in Shaanxi Province, and Mr. Cai from readers of Fufeng County, have called this newspaper. Subsequently, the reporter consulted relevant experts, experts said that this is a walnut tree suffering from branch blight, walnut branch blight is caused by fungal infection, the main damage to the branches, occur everywhere, the general disease strain rate of 20% to 30% Serious diseased planting rate of more than 80% caused a large number of shoots to die, directly affecting tree growth and walnut yield and quality.
Cause of morbidity 1. Clear Garden is not complete. The pathogenic bacteria overwinter on dry branches and the spring of the next year is transmitted by wind, insects, and rain. The onset of disease occurs from May to June, and the onset of disease occurs from July to August. 2, management is not in place. First, lack of water and fertilizer, the tree weakened, disease resistance decreased, the incidence rate is high; Second, soil hardening, root development, poor absorption function; Third, the management process due to careless operation caused by mechanical wounds, is conducive to bacteria invasion; Fourth, late frost damage can easily cause saplings and shoots to infect the disease. 3, shaded in the park, poor ventilation and light transmission, and weak and easy growth of branches.
Prevention and control methods 1, completely clear the park. In winter, the dead branches, fallen leaves, and diseased fruits in the park were removed and brought out of the park and burned. The trunk was painted white in winter with a whitening agent. 2, strengthen management. One is to deepen the soil. When the walnuts are harvested and before the leaves fall into the soil, the depth of deep turning is 20-30 cm. The second is to apply sufficient fertilizer, combined with deep-turning each adult tree into the maturity of 150 to 200 kg of organic fertilizer, from June to July topdressing a nitrogen, phosphorus, potassium compound fertilizer. Third, timely irrigation, promote the robust growth of the tree, improve disease resistance. 3, cut off dead branches. The diseased branches were cut off in time and brought out of the park and burned. At the same time do a good job in summer cut, remove sticky branches, pests and branches, leggy branches, improve ventilation and light conditions, reduce the incidence. 4, pharmaceutical control. In 6-8 months, 70% thiophanate-methyl wettable powder 800-1000 times or 400-500 times mancozeb WP can be sprayed and sprayed once every 10 days, even for 3 to 4 times. Obvious control effect. At the same time, it is necessary to prevent and control pests such as cloud beetle and walnut small giardia in time to prevent bacteria from invading.
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