Hebei Province is a temperate continental monsoon climate with an annual sunshine duration of 2303.1 hours, an annual frost-free period of 81 to 204 days, and an average annual precipitation of 484.5 mm. The leading industry is walnut, but in recent years due to freezing, high temperature damage, floods and other extreme weather. Frequent occurrences affect the development of the walnut industry. Therefore, today Xiaobian talks about the impact of extreme weather on walnut trees in Hebei Province and countermeasures for your reference. 1 Management measures after freezing damage in winter and spring 1.1 Symptoms of seedling freezing damage After the walnut seedlings are frozen, the seedlings will have symptoms such as water loss and shrinkage, yellowing of the layer, blackening of the heart of the medulla, and dryness of the leaves. 1.2 Tree protection After heavy snow, remove the snow from the trunk and the tree in time to prevent the freezing damage and the occurrence of walnut tree rot; after the snow, the smoke is anti-freezing, generally continuous smoked for 2 to 3 nights, which can effectively promote cold and antifreeze; 1 year old walnut seedlings Can not afford to squat, indefinite seedlings, slow seedlings to restore growth, the night when the minimum temperature rises above 0 °C, early application of nitrogen fertilizer, early irrigation, 20 kg of nitrogen fertilizer per acre, 10 kg of phosphate fertilizer, should go in time after germination Weak and strong, and cultivate the backbone. 1.3 Fertilization and watering After the soil is thawed, it is fertilized and watered once before germination. The fertilization adopts the ring-shaped or radial fertilization ditch method. The big tree is applied with 50 kg of organic fertilizer and 1-2 kg of urea per plant, and 0.2-0.5 of urea is applied to each plant. Kilograms, watered immediately after fertilization; spray the mixture of 0.1% to 0.3% urea and potassium dihydrogen phosphate after spreading the leaves. 1.4 Prevention and control of walnut tree rot Walnut tree rot is very prone to occur after freezing damage. Therefore, when the walnut tree is rotted, the rot is used to scrape the rot. After that, the razor is sterilized by the 3 times of the 9281 solution, and the smear is applied. Conducive to wound healing. 2 Prevention and management measures for high temperature disasters 2.1 walnut high temperature hazard High temperature of walnuts will cause the branches of the branches to dry up or the whole branches to die. When the fruit is light, the round yellow-brown lesions will appear. When the damage is serious, the nuts will be harmed and the yield will be seriously affected. 2.2 Prevention methods Moderately thick leaves; dry weather should pay attention to watering, reduce temperature, increase humidity; spray 50 times of lime milk to the fruit surface before high temperature, reduce fruit surface temperature. 3 Management measures after the flood season in the rainy season 3.1 Hazards of flood disasters on walnut trees If the rainfall is too large, it will cause flooding in the walnut garden, leading to early defoliation, fruit drop and fruit cracking of the walnut tree, and the root system will die due to lack of oxygen. 3.2 Drainage For the walnut garden where water is accumulated, it is necessary to clear the drainage ditch in time and drain the water. 3.3 Helping the tree, washing the leaves Timely treatment of walnut trees immersed in mud and water by muddy water, for the root system exposed to be washed out, it is necessary to timely correct the right, for the serious loss to provide bracket protection. 3.4 dredging, shallow tillage For walnut gardens covered with silt, the silt should be cleaned up in time after raining, so that the walnut trees can resume normal breathing; after heavy rain, shallow tillage is carried out to prevent soil compaction and cracking after heavy rain. 3.5 Fertilization The roots of fruit trees affected by floods have different degrees of damage. Therefore, it is best to spray functional foliar fertilizers containing humic acid and amino acid fertilizers. The soil topdressing should be determined according to the degree of damage caused by the trees. Topdressing 2-3 times; for fruit trees with positive flower bud differentiation, stable fruit and strong fruit, topdressing can add appropriate amount of phosphorus and potassium fertilizer. 3.6 Spraying drugs in time to prevent diseases Floods, high temperature and high humidity are prone to various diseases and physiological diseases, especially walnut anthracnose and walnut tree rot. Therefore, it is necessary to strengthen the management of disasters and timely spray drugs on the basis of strengthening the tree. Commonly used agents are Dasheng M-45, ethylphosphorus aluminum, manganese zinc, phlegm, streptomycin sulfate and the like. 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