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1. Promote apple fruit surface coloring:
Through bagging, apple fruit grows under shading conditions for a long time, which inhibits the synthesis of chlorophyll, so that the background color of the peel surface becomes lighter, which is conducive to the full display of anthocyanins. It makes the fruit appear bright red on the basis of a very small amount of green background. Such as red varieties of red Fuji, new red star, Jonagold and so on.
2. Prevent and remove fruit rust:
After bagging apples, the micro-domain environment of each part of the surface is relatively uniform, which greatly reduces the direct stimulation of external adverse environmental conditions such as wind, rain, pesticides, harmful light, etc., thereby reducing the self-protection function of the fruit, and the peel development is stable. , gentle, the cells of the epidermis are tightly arranged. By bagging and shading, the epidermal cells secreted less wax, the synthesis of lignin was reduced, the occurrence and activity of cork cambium was inhibited, and the occurrence of lenticels was less and smaller. In addition to preventing fruit rust and fruit spots becoming smaller, bagging apple fruit can also prevent coal stains, drug spots, branches and leaves that pollute the fruit surface, and make the fruit surface smooth and beautiful.
3. Reduce pesticide residues:
After the apple fruit is bagged, the paper bag blocks the contact between the fruit surface and the outside world, and the chance of germs invading is greatly reduced. Practice has shown that bagging has a good control effect on fruit-boring pests such as heart eaters, leaf rollers, mites and stink bugs that lay eggs on fruit surfaces and leaves. It also has a good control effect on various fruit diseases such as ring disease, anthracnose, red star disease and other fruit rot diseases, and the number of spraying can be reduced by 2 to 4 times throughout the year. As apples were bagged, the frequency of medication was reduced, thereby reducing pesticide residues. It was determined that the pesticide residues in bagged fruits were only 0.045 mg/kg, while those in unbagged fruits were 0.24 mg/kg. Apple bagging has become one of the indispensable measures for developing green food.
4. Improve the storage of fruit:
After the apples are bagged, the lenticule coverage value is reduced, the cuticle is evenly distributed, and the fruit is not easy to lose water and wrinkle the skin; the bagging reduces the infection of pests and diseases, greatly reduces the disease during storage, and improves the storage performance of the fruit. Generally, apples can be stored for 120 days, and the rotten fruit rate of bagged fruit is 0.8%, and that of unbagged fruit is 14.2%;
The water loss rate was 5.5% for bagged fruit and 5.8% for unbagged fruit. The effect of bagging on peel structure is also constrained by a variety of environmental conditions. For example, the selection of different bag types, the selection of tree and fruit, the period of bagging and bag removal, and different regions all have a very important impact on the development of fruit peels after bagging. It has been confirmed that the better the shading of the fruit bag and the earlier the bagging period, the more significant the bagging effect will be. In addition, the humidity in the bag after bagging plays a crucial role in the development of the peel structure.
5. Improve the value of fruit commodities:
After bagging apple fruit, it can prevent dust, pesticides and other pollution on fruit surface and fruit surface soot. In addition, it can also prevent the harm of birds, giant beetles, and bees, as well as prevent hail from damaging fruits. For apple varieties that are prone to cracking, bagging can prevent the occurrence of cracking and greatly improve the economic benefits of cultivation. Before bagging apples, fruit thinning must be combined, and there is almost no residual fruit, thus greatly improving the fruit setting rate of the fruit. In addition, after bagging, it is beneficial to harvest in stages for varieties with inconsistent maturity and growth, and will not be harmed by pests and diseases.
It can rapidly increase the number of fruits, improve the fruit grade and commodity value, and increase economic benefits. According to the market survey of bagged Fuji apples in recent years, the price of bagged apples is 1-2 times higher than that of unbagged apples.
