First, hail damage to apple production In recent years, locust plagues have frequently occurred in apple production areas, causing apple trees, branches, leaves, and fruits to be damaged, broken, shed, and other mechanical damage. The aboveground parts have been damaged, and photosynthesis has been severely affected. If all of them are knocked down, the growth of the tree is blocked, causing great losses. Not only did the hail cause a reduction in production in the same year, but it was also very unfavorable for the production of the next three to five years. What was more serious was that the enthusiasm of the masses for planting apples was severely frustrated, resulting in abandoning the management of most orchards after the disaster and threatening to dig trees and destroy the garden. Second, hail disaster prevention and control technology 1. Zoning planting, avoiding building gardens. Hail is formed in cumulonimbus clouds with certain meteorological conditions. The area of ​​cumulonimbus clouds forming hailstones is relatively narrow, and often moves along mountains and river valleys. The width is usually a few kilometers or less, and it can reach several kilometers to several tens of kilometers or even longer. It has obvious paths, that is, " Beat a line." The occurrence of hailstones is also related to topography and landform. Generally, there are many plains and mountains in the mountainous areas, few bald hills and many forest lands, and more windward slopes and fewer leeward slopes. Therefore, in the development of apple production in various places, it is necessary to carry out the cultivation division on the basis of full understanding of the characteristics of hail occurrence, local landforms and hail path, and avoid the hail-prone zone to choose the site to build the park. 2. Artificial flood control. Explosion method: In recent years, air blast guns and earth mortars have been widely promoted throughout China's reclamation areas and can be fired to a height of 300 to 1,000 meters. In some areas, various types of rockets have been manufactured, and they have been launched into anti-aircraft artillery several kilometers away. The blast wave generated during the explosion can affect the flow of the hail cloud, make the hail cloud change its direction of movement, and also freeze the supercooled water droplets, thus suppressing the increase of ice particles and melting the ice hail into rain. Chemically catalyzed method: use a rocket or anti-aircraft gun to shoot the warhead with catalyst (silver iodide) into the supercooled area of ​​the hail cloud. The particles of the drug act as an ice core. Excessive ice nucleus eats cold water without letting the grain grow long. Large or delay the increase of hail. 3. Protect cultivation. Fruit bagging is an important measure for the production of high-quality fruit, and it is also an effective method for alleviating the loss of disaster relief. 4. Use flood prevention nets. Setting up flood control nets in orchards can reduce hail disaster losses. Flood prevention net refers to the erection of a special nylon net or lead wire mesh above the orchard to block the impact of hailstones and protect the fruit trees. III. Remedial Measures After Disaster Relief 1. Clean up the orchard and reduce the source of the disease. Timely clean up the hail, debris and fallen fruit in the orchard. For the orchard with muddy water after the disaster, the water shall be drained in time to remove the mud and expose the dried fruit branches. In addition, once every 10 to 15 days, spray a fungicide (such as bactericidal agent, bactericide, bacteria must clear, carbendazim, etc.), and spray twice to reduce the source of disease and prevent the invasion of bacteria. 2. Loosing the soil and raising the roots and trees. After the occurrence of locust plague, it is necessary to continuously plan the soil 2 or 3 times. This will not only excrete too much water in the soil, but also improve the permeability of the soil. It can also restore and promote the physiological activity of the root system, so as to achieve the purpose of rooting and strengthening the tree. 3. Top dressing supplement, restore the tree vigor. The first is foliar spray fertilizer, spray once every 10 days 0.3% potassium dihydrogen phosphate solution, spray 2 or 3 times, can promptly solve the problem of tree nutrient deficiency; followed by topdressing NPK fertilizer, each 0.5 to 1 kg of strain. After the apple tree is restored to life, fertilization is mainly based on farm manure, and it is equipped with appropriate quantified fertilizer. In drought, fertilize with fertilizer. 4. Wound protection. Affected fruit trees have a large number of wounds, giving rot pathogens an opportunity. In addition, the leaves have been washed out and the tree vigor has weakened. This has led to a rot disease pandemic and prevention of rot has become an important part of management. Targeted treatment should be carried out according to the occurrence of illness. For lesions smaller than 1/2 of the branches, the skin can be completely scraped and rubbed with acne blue, schnering, bactericide, etc.; if the lesion is larger than 1/2 of the branches, there is no treatment value. Even if scraping cures, it will not be able to bear good fruit. It is better to see it completely. 5. Thinning the fruit. Immediately after the disaster, the bad fruits of bruises will be wiped out to save nutrients and restore the tree potential as soon as possible. 6. Trim. The disaster-affected orchards are severely damaged due to the balance between the ground and the underground. They should be cut in the winter to establish a new balance system. Pruning should be done as follows: 1 Saw severely decayed branches. For branches that have rotted or rotted, they should be completely sawn to control the spread of rot disease. 2 to rotten to stay healthy, to stay light. After the apple branches were affected by the disaster, most of them had normal growth on one side and were seriously injured on one side. Due to the different growth conditions of the branches, the degree of harm is not the same. In general, the damage of the upright branches is lighter, the more the branches are flat, the more severe the injuries are. When pruning, according to the healing conditions of the branches, choose the best possible and lightly damaged shoots. This part of the branches of nutrient delivery channels smooth, in the future can produce good fruit; for bad branches, severely damaged branches can be removed In order to stimulate the germination of nearby buds, new branches are drawn and new results are formed. 3 insurance can guarantee, can not guarantee is cut. After the flood disaster, a considerable part of the apple trees are faced with excavation. The excavation is a reservation. Not only the damage to the trees but also the age of the trees should be referred to. Generally, for trees with a younger age (less than 10 years old), the trunks are lighter and the branches are healed. Not so good, you can use a 2 to 3 cm short cut method to restore the crown. Because the weight of shoots can be shortened, the nutrient supply can be concentrated. Because of the relatively strong root system, it is possible to promote the growth of branches and accelerate the recovery of the crown. At the same time, the branch ratio can be effectively opened, and the high-efficiency tree with high light yield can be cultivated. After one year's recovery, the output can be formed in the third year, and the output can be recovered in 4 to 5 years. For trees aged 10 to 20 years, it is not necessary to overemphasize the tree shape. For the purpose of maintaining a certain amount of production, common branches should be kept as much as possible to promote the increase of yield. For trees aged 20 years or more, the ability of the trees began to decline because of the aging of their own trees. If the trees are seriously affected, they should make a determined effort to carry out thinning and rebuild the park. Bifidobacterium Breve,Bifidobacterium Breve Powder,Bifidobacterium Breve Probiotic,Microbiota Bifidobacterium Breve Jiangsu Biodep Biotechnology Co. ,Ltd. , https://www.mbioda.com