Brief introduction of fruit bagging technology of pear

1. Bagging effect: it can improve fruit quality, control fruit diseases and insect pests, reduce pesticide residues and increase fruit storability.

two。 Selection of paper bags: suitable paper bags should be selected according to different varieties, different climatic conditions, different bagging purposes and economic conditions. The single-layer bag is suitable for the varieties of green pear, and the paper bag with strong shading is suitable for the varieties with large and dense fruit spots. Among Japanese pear varieties, Fengshui pear should use single-layer Kraft paper bags coated with paraffin, Xingshui should use paper bags with green inner layer and outer white and black outer layer, and Xinxing, Xingao, late Sanji and Xinxue should use double-layer bags with red inner layer.

3. Bagging period: stomatal pores generally start from 10 to 15 days after anthesis, the longest is 80 to 100 days after anthesis, and the young fruit stage is the most concentrated after 10 to 15 days after anthesis. Therefore, in order to restrain the development of fruit spots and obtain beautiful fruits, the bagging period should be earlier, generally starting from 10 to 20 days after falling flowers, and bagging within about 10 days, and if bagging to protect the fruit 25 to 30 days after falling flowers, at this time, most of the stomata have turned cork brown, forming fruit spots, which can not achieve the expected effect of bagging.

4. Bagging method: bagging can be carried out after strict flower thinning and fruit thinning and spraying. When bagging, hold one end of the bag mouth with your right thumb and index finger, take off a fruit bag horizontally, twist the bag mouth, hold the bottom of the bag with one hand, put the other hand into the bag and open the bag body, pinch the two corners of the bag, open the ventilation outlet at the two bottom corners, and bulge the whole bag body. Hold the fruit handle in one hand and the fruit bag in the other, put the fruit into the bag from bottom to top, and place the fruit handle in the middle of the bag mouth, so that the fruit is located in the middle of the bag body. Squeeze longitudinally from the middle fruit stalk of the bag mouth to both sides, fold the bag mouth to the fruit handle, tear it open above the silk mouth, reverse the binding wire by 90 °, rotate along the bag mouth once and tighten the bag mouth at 2 canister 3 places above the fruit handle. Then hit the middle of the bottom of the bag, so that the bottom of the bag two ventilation water outlet open, the fruit bag in an upright drooping state.

Pear fruit bagging is best for the whole garden and the whole tree, which is convenient for centralized and unified management after bagging. If you want partial bagging, you should choose the golden mean or moderate strong trees in the early peak fruit period, and do not choose old and weak trees, weak trees, diseased trees, tuyere trees, especially small old trees. For a tree, there are fewer pears in the south and southwest to reduce the rate of daily fruit burning. Choose the fruit on the branches in the middle or front of the tree, without covering the inner chamber and the outer tip, setting strong branches and strong fruits, not weak branches and weak fruits.

5. Bagging precautions: make sure that the young fruit is in the middle and upper part of the bag body and does not come into contact with the bag wall to prevent stink bugs from prickling fruit, abrasion, sunburn and potions, bacteria and insect secretions from contaminating the fruit surface through the bag wall. In the process of bagging, you should be very careful not to touch the young fruit, resulting in artificial "tiger skin fruit", do not use too much force, to prevent breaking the fruit handle, pulling the base of the fruit handle or binding the wire too tightly to affect the fruit growth or too loose to cause the wind to blow off the fruit bag. The mouth of the bag should not be tied into the shape of a trumpet to prevent the accumulation of Rain Water. Fasten it tightly so as not to damage the fruit stalk to prevent Rain Water and liquid medicine from flowing into the bag or diseases and insects from entering the bag. Be careful not to put the leaves in the bag. When bagging, you should first go up the tree and then under the tree, first inside and then outside, so as to prevent the fruit from falling after putting on the paper bag. As far as a tree or a park is concerned, it is best to bag the whole plant or the whole garden to facilitate centralized and unified management after bagging. When bagging, try to make the fruit evenly distributed in the tree, one branch can not be bagged too much, so that the fruit bags are adjacent to each other. It is best to keep a single fruit in an inflorescence and only one fruit in a fruit bag.

6. Bagging: pear fruit sugar content decreased, pre-harvest bagging can increase the fruit sugar content to a certain extent, but the effect is not obvious, but has a significant effect on fruit points and fruit color, that is, pre-harvest bagging reduces the effect of bagging to improve fruit appearance quality. Therefore, the pear varieties that do not need coloring in the fruit ripening period should be harvested with bags, and then remove the bags when grading. Because the pear skin of bagged pears is relatively delicate, bagged harvesting can prevent the fruit from losing water, damaging the pericarp or polluting the fruit surface.

7. Bagging supporting technology: bagging garden should strengthen soil fertilizer and water management, deep ripening to expand living soil layer, enhance root function, increase fertilizer application, develop strong and strong trees, and pay attention to weak trees not bagging. In the aspect of shaping and pruning, the amount of branches and leaves should be reduced properly, the distribution of branches should be reasonable, the light should be uniform and the results should be three-dimensional. Pay special attention to flower and fruit thinning, reasonable load, prevent tree potential from weak, and improve the commercial fruit rate of bagged fruit. In addition, special attention should be paid to the prevention and control of special diseases and insect pests after bagging, such as yellow powder insect, Kang's pink scale, pear wood lice, stink bugs, sunburn, water lice and so on.