The practice of pear fruit bagging in recent years shows that after bagging the fruit of Dangshan Pear, the fruit surface can be bright and delicate, and the color is golden; the fruit spots are small and small, and basically no rust; and pear black spot disease and roulette can be effectively avoided. Diseases, black spot disease, and pests and diseases such as P. edulis, P. syriacus, and P. syriacus, can be reduced by spraying 3 to 4 times a year, and the amount of pesticide residues in fruits is significantly reduced. In addition, after adopting some comprehensive management measures, the disadvantages of reduced sugar content after bagging can also be avoided. The fruit bagging of Dangshan Pear and its supporting techniques are summarized below. The choice of paper bag Dangshan Pear Bagging should use double-layer, two-color pure wood pulp paper bags. Requirements: size and specification, high wet strength, outer bag hydrophobicity and air permeability, uniform waxing inside the bag, 20#thick wire 3~4cm long on the side of the bag mouth, half circular notch on the center of the inner and outer bag pockets The inner bag is 17-19 cm long, the outer bag is 19-20 cm long and 16 cm wide. Practice has shown that all kinds of paper bags can make the fruit spot smaller and less, and the fruit surface is basically rust-free, but the yellowish-green bag fruit outside the set is yellowish-green, with delicate skin and high finish, and the sugar content is reduced by 0.1 ~0.3%, the fruit is close to normal size; outside the set of red berries inside the yellow milky yellow, fine skin, good luster, sugar content decreased by 0.2 ~ 0.5%, a fruit slightly smaller than the outer set of yellow inner white bag fruit; The fruit of the black bag inside the outer yellow (or outer ash) was milky white, and there was a big difference between the color of the bag and the unsacked fruit. The sugar content decreased by 0.6 to 0.8%, and the fruit was small. Therefore, Dangshansu Pear Bagging should be the first choice for outer yellow white paper bags, followed by outer yellow inner red paper bags. The fruit bagging technique generally starts bagging 20 days after flowering and ends after 1 week. Most of the stomata in the late bagging were corked to form brown fruit spots, affecting the appearance of the fruit and failing to achieve the desired effect. Bagging prematurely due to paper bag shading will affect the development of the cuticle and the epidermis of the young fruit. The glossiness of fruit will be reduced and the fruit will become smaller, and later the skin cracking will occur easily. Bags can be bagged from morning dew to early evening during the day, but it is advisable to use 8 a.m. to 11 p.m. and 3 p.m. to 6 p.m. in sunny weather, high temperatures, and strong sunlight. When opening the bag, open the paper bag with your left hand, lift the bottom of the bag with your right hand, open the vent holes on the bottom of the bag, and bulge the paper bag. Put it on the fruit so that the fruit is suspended in the center of the bag. Use the iron wire to fasten the bag mouth. Strict. When the sleeve is set, the upper part of the tree body is covered with the lower part of the tree, and the outer part of the inner part is followed by the outer part. One inflorescence only covers one fruit. Before and after fruit bagging, fruit bagging matching technology must be implemented in order to receive satisfactory results. Management before bagging 1 The management of fertilizer and water of the bagging tree must be strengthened. After the fruit is harvested, apply the “fertilizer and fertilizer†fertilization standard, apply the decomposed high-quality organic fertilizer, and mix appropriate amount of phosphorus, iron and zinc fertilizer. Immediately after flowering, apply topdressing fertilizer or fungicide. Bagging pears are easily deficient in calcium and should be sprayed with calcium fertilizer 2~3 times before bagging. The amount of irrigation and irrigation of bagged pear orchard should be more than that of unopened pear orchard. Flood irrigation. The bagging tree must be finely pruned. According to the requirements of pruning of the fine pears, proper amount of flowers should be left in place, so that the amount of retained fruit and the position of the fruit can be adapted to the single fruit weight of the best commercial fruit. Sparse branches, thin and thin branches, competing branches and leggy branches are eliminated to ensure that the branches are dense and appropriate, and the ventilation and light transmission are good. 2Prevention and control of pests and diseases in early spring and before and after flowering In order to effectively prevent and control pests such as pear sassafras, yellow pecker, whitefly, black sclerosis, and rosy rot etc., insecticides and bactericides should be sprayed carefully before bagging, such as m-m. 45 Wettable powder 800 times liquid plus 10% imidacloprid wettable powder 2500 times. Focus on spraying the fruit surface, but do not get too close to the fruit surface, otherwise the water pressure will cause the mechanical damage to cause rust or phytotoxicity on the fruit surface. The spray should be fine and uniform, sprayed onto the surface of the fruit and washed. After the liquid is dry, the bag can be bagged. When the liquid is not dry, the bag is prohibited. Spray trees need to be sprayed within 2 to 3 days after spraying. In addition, in mid-February, care should be taken to remove the rough skin and rough skin from the trunk, branch bases, and branch fork, carefully clean up the branches and leaves of the pear orchard, and collect and burn them so as to reduce the number of disease-infested winter bases. Before bagging, fruit thinning must be completed. Generally, fruit thinning begins 15 days after flowering and is completed within 1 week. All the bagged inflorescences were left as single fruits, and the malformed fruit, rough skin fruit, disease and insect fruit, and fruit that was too dense were removed, and 10,000 to 12,000 fruits were left per acre. After bagging, the bagging period of the young fruit after fruiting is timely and the fertilizer is applied to promote the growth of the young fruit. After disabling nitrogen fertilizer in mid-June, topdressing should be dominated by phosphorus and potash fertilizers. After spraying 3 to 4 times of 400 times potassium dihydrogen phosphate and 2000 times of red fruit 88 and other foliar fertilizers, it will take about 10 days from the bag to pick up the spray. Secondary calcium fertilizer. Bagging fruit is prone to sunburn. Therefore, after bagging, it should be poured once per day, combined with topdressing, to prevent drought, and to prevent sunburn. Watering is strictly prohibited 20 days before picking so as not to reduce the sugar content of the fruit. Pay attention to timely drainage in the rainy season. Pear fruit bagging can significantly reduce the pest damage, but the dark environment inside the bag is conducive to the survival and breeding of hi-yin yellow fly aphid and cornel mealybugs, such as bag mouth ligation or improper control, can increase its harm . Therefore, from the middle of June to the end of August, it is necessary to sample bags for frequent inspections, especially from early July to mid-August, check once every 10 days, and if it is found that 5% of the bags contain insects, the bags should be promptly removed. , spraying 5% acetamiprid EC 2000 times or 10% imidacloprid WP 2500 times. In order to increase the sugar content of the fruit, the bags can be removed 10 to 15 days before picking, which can increase the sugar content of the pear fruit 0.2~0.3%, and can improve the color of the fruit surface and improve the finish. In addition, it was observed that the fruit ripening period of the bagged pear was relatively later than that of the non-jacketed fruit; however, the sugar content of the fruit changed significantly within 20 days before mature harvest, and the soluble solid content increased by 1 to 2% within 10 to 20 days. Therefore, in order to increase the sugar content of the bagged fruit, it can be taken about one week later.