What are the technical points of bagging sand pears?

Sand pear has thin skin, snow-white pulp, fine and crisp fruit, sweet and fragrant taste and high nutritional value. at present, the planting area is expanding year by year, and bagging is a very important link in the cultivation of sand pear. Here is a detailed explanation on the technical points of sand pear bagging.

First, the choice of sand pear bagging

According to the material, fruit bags can be divided into plastic bags and paper bags, and their quality directly affects the bagging effect. Therefore, it is necessary to choose and buy fruit bags with certain production scale, reliable quality, high market share and good local application effect. The size and type of the fruit bag should be determined according to the variety, generally the single fruit weight is 250 × 19.5 grams, the bag size should be 15 × 19.5 cm; the average single fruit weight is 250 × 19.5 grams, the bag size should be 15 × 19.5 cm, the average single fruit weight is about 400 million grams, and the bag size should be 20 × 23 cm.

Sand pears generally choose double-layer paper bags with yellow on the outside and red paper on the inside. at present, in addition to imported high-quality fruit paper bags, China has been able to produce special bags for different types of fruits with good quality.

Second, the time of bagging sand pears

Scientific bagging time is determined according to fruit tree variety, tree age, tree potential, phenology and many other factors. At the same time, it is also important to grasp the bagging time of the day in the morning when the dew is dry and the fruit does not attach water droplets or medicine droplets, usually at 12: 00:00 and 1500 hours, to avoid noon bright light and rainy days.

The best bagging period of sand pear is 15-45 days, after fruit thinning to before the appearance of rust spot. Bagging early in the young fruit stage will affect the development of the fruit, too late bagging will change the color of the pericarp later, the appearance and luster is poor, the stomata become fruit spots, and the surface of the cuticle is easy to crack.

3. Bagging method of sand pear

2-3 days before bagging, in addition to the necessary preparatory work, fruit trees need to be thinned according to the load; appropriate amount of fungicides, acaricides and foliar fertilizer should be sprayed on fruit trees; wet softening treatment of fruit bags should be carried out, a small amount of water should be sprayed to the mouth of the bag, and then the whole bundle should be placed in a wet place or buried in wet soil with a single-layer newspaper to make the fruit bag return to moisture and flexibility.

After selecting the young fruit, carefully remove the petals and other sundries attached to the young fruit, hold the paper bag with the left hand, open the bag mouth with the right hand, or blow open the bag mouth with the mouth to make the bag body inflate, so that the aeration water hole at the bottom of the bag is opened, holding the bag mouth 2-3 cm below, the bag mouth is up or down, into the fruit, and the fruit stalk is placed at the base of the opening of the bag (do not put leaves and branches into the bag) Then fold the bag mouth in a "folding fan" way from both sides of the bag mouth, fasten the binding wire to the folding place, tear the binding wire from the connection point above the line mouth and turn the binding wire back to 90 degrees, rotate and tighten the bag mouth for one week along the bag mouth, so that the young fruit is in the center of the bag body, hanging in the bag to prevent the bag body from rubbing the fruit surface, and do not wrap the binding wire on the fruit stalk.

In addition, when bagging, we should also pay attention to: first, the bagging order is first up and then down, first inside and then outside, so as not to touch the fruit; second, when bagging, the direction of force should always be upward, so as not to pull off the young fruit, the force should be light, and try not to touch the young fruit; the third is to strictly select the young fruit with correct shape, tight calyx and well-developed fruit; fourth, the mouth of the bag should be tied up to prevent pests from climbing into the bag to harm the fruit and prevent the paper bag from being blown off by the wind. Fifth, because the fruit bag is coated with pesticides and wax, wash your hands in time after operation to prevent poisoning.

Fourth, the bagging period and method of sand pear after bagging.

The bagging period of fruit trees varies greatly according to bagging tree species, varieties and bagging types. single-layer bags of yellow-green varieties can be removed or not bagged during harvest.

The suitable time for removing bags in one day is 9: 00 am, 11: 00 am and 3: 00 pm. In the morning, except for the paper bags on the south side, be sure to avoid the time when the sun is strongest at noon, so as to avoid sunburn. Cloudy days can be carried out all day. Grapes can be harvested without bags, or they can be removed about 10 days before harvest.