How to give Dangshan pear fruit thinning and bagging?

How to give Dangshan pear fruit thinning and bagging? Please guide Dangshan pear fruit thinning and bagging can refer to the following methods: first, fruit thinning technology: crisp pear fruit thinning begins one week after falling flowers and is completed within one month, and it is better to thinner late than early. The principle of keeping fruit should be that it does not affect the formation of flower buds in the second year, ensure the yield and quality of the current year, and do not weaken the tree potential and have a certain nutritional reserve. Fruit retention index should consider the following factors: 1. According to tree potential, tree age, planting density and fertilizer and water conditions, establish the yield index per unit area, calculate the average yield per plant, then determine the yield according to the tree, calculate the fruit retention per plant according to the average fruit weight 250g~350g, and then distribute the fruit retention according to the load capacity of each branch group. 2. The amount of fruit retained was determined according to the leaf-fruit ratio of 25 to 30. 3. The amount of fruit retained is determined according to the branch-fruit ratio at 4:1. For young trees, the branch-to-fruit ratio can be reduced to 2.5 × 3 and 1, while for weak and old trees, the branch-to-fruit ratio should be increased to 4.5. According to the reasonable fruit retention index, in order to ensure the high and stable yield of the tree, the following methods should be adopted: 1. Thinning the middle fruit, leaving the edge fruit, thinning the small fruit, abnormal fruit, leaving the big fruit and the right fruit. 2. There are more strong branches and less thinning branches, and more thinning of weak branches. 3. There is more thinning in the inner chamber of the crown, less sparse in the middle and outside, more sparse in the crown, less sparse in the crown and more under the crown. 4. The base and top of the main side branch are more sparse than the top, and the middle part is less sparse and more, so that the fruit is distributed evenly and densely properly. 2. Bagging technology: 1. Selection of crisp pear bags: it is best to choose wax bags or sulfuric acid paper bags with strong toughness and good air permeability. The week before bagging, soak the bag mouth with 50 times liquid of 6% lindane powder to 4 places at the mouth of the bag. Use it after drying, which can reduce the rate of yellow powder insects entering the bag. 2. Bagging period: it is suitable for bagging crisp pears from mid-May to early June. 3, bagging operation technology: after selecting the pear fruit, open the paper bag to make the bag body expand, then hold the middle of the bag bottom slightly upward with a little effort to show a "W" shape, so that the bottom corner of both sides is slightly lower, the ventilation water outlet is slightly opened, and the fruit is suspended in the center of the bag. Hold the bag mouth at about 2cm, fold the bag mouth from the middle to both sides in turn, and tie the iron wire (or iron sheet) along the bag mouth for a week. 4. Pest prevention after bagging: always investigate the harm of yellow powder insects in the bag after bagging, spot check more than 3%, and spray 3000 times of 50% aldicarb ultra-fine wettable powder or 50% dichlorvos EC 1000 times when there are yellow pink insects in the bag. Spray the bag wet. If the yellow powder insect is heavy, it needs to be unbagged. Click to get more crisp pear planting techniques click to get more fruit planting techniques