Fruit bagging is an important technology for the production of high-quality, high-grade fruit, and an important technical measure for the production of pollution-free green fruits. After the bagging, the color of the ear is bright, smooth and non-polluting, which greatly improves the market competitiveness. The sales price of the bagged grape market is 20%-50% higher than that of the bag.
1. The purpose of bagging: grape bagging can reduce the pests and diseases of fruit growth period, reduce sunburn, reduce the pollution of pesticides and dust, and improve the smoothness of fruit surface; grape bagging can improve the micro-environment of fruit growth and make fruits Uniform coloring, bright colors, fine peel, improve fruit flavor, greatly improve fruit quality and improve its storability.
2, the choice of bagging: the choice of fruit bags should be based on the micro-environment on the appearance of the fruit, the formation of internal quality, according to the variety selection has strong weather resistance, good ventilation, high transparency, high hydrophobicity, anti-bacterial characteristics Paper bag. The fruit bags made of newspapers and the like have poor hydrophobicity, poor tensile strength and high breakage rate, and are easy to breed fruit diseases; the non-woven fabric has good air permeability but is prone to sunburn. At present, grape special bags combining plastic film and special paper are the best in production, and can be used for different requirements.
3, bagging time: bagging time sooner or later also directly affect the effect of bagging, early set is not conducive to fruit thinning, set the disease infected with ears late, if the bagging is too late, in mid-June, the consequences of panicle easy to infect Pathogens, especially white rot, anthracnose, acid rot, gray mold and so on. Generally, bagging is carried out 15-20 days after fruit setting, that is, when the fruit pieces grow to the size of the beans, they are granulated and bagged immediately after the whole ear. Suddenly after the rainy weather, do not pack the bag immediately, because it will make the sunburn worse. After a day or two, the fruit is slightly adapted to the high temperature environment and then bagged. Bagging time is best before 10 am or after 4 pm to reduce sunburn.
4, go to the bag: after the bag is removed until the harvest is mainly to make the berry coloring, in the case of insufficient sunshine, poor color, you must remove the paper bag 2-3 weeks before harvest, improve the coloring effect (cyan grapes can not go to the bag) . After removing the bag, rotate the ear one or two times according to the condition of the ear, so that the fruit and the fruit string are evenly colored.