Detailed Explanation of the Latest Precautions Before Bagging Grapes
Grapes are one of the better-known types among grape varieties, and growing grapes has become a job for some people. Every year, China's demand for grapes is very large, so many people want to increase yields and have expanded the planting area. In fact, doing some management work during planting can also effectively increase yields, and bagging is one of those measures. So what should we pay attention to when bagging? Let's take a look together below!
1. Calcium supplementation for young fruit
Bagging is generally carried out when the fruit is not yet fully ripe, that is, during the young fruit stage of grapes. The young fruit stage is also a critical period for the fruit to absorb calcium. Calcium is transported into the fruit along with water, but bagging too early will affect the fruit's absorption of calcium. If calcium is deficient, symptoms such as dead leaves, fruit cracking and fruit drop will appear. Dead leaves will also reduce the accumulation of nutrients in the fruit, leading to lower fruit quality. Therefore, before bagging, we should pay attention to spraying an appropriate amount of quick-acting nitrogen fertilizer to promote the fruit's absorption of nitrogen and prevent various physiological diseases caused by nitrogen deficiency.
2. Stabilize tree vigor
Before bagging, we should observe the tree vigor and decide the bagging time according to the growth condition of the tree. If the tree grows too vigorously or too weakly, it is not conducive to the development of the fruit after bagging. We should properly adjust the tree vigor and keep the growth stable at a medium to slightly vigorous level. If the tree vigor is too strong, the fruit will lack nutrients after bagging, and bagging will instead affect the fruit's nutrient absorption. The principle is much the same when it is too weak. When it is too vigorous, use less chemical fertilizer; when it is too weak, increase the application of organic fertilizer to supplement the soil nutrients, and carry out bagging work after the tree vigor recovers.
3. Rational use of pesticides
As everyone knows, before bagging, the tree, fruit and other aspects must be disinfected. Before bagging, we should spray disinfectant at least twice to eliminate pathogens and reduce the incidence of various diseases. However, when disinfecting, pay attention to the use of disinfectants and insecticides, choose varieties that cause less harm to the tree, and control the dosage well. If the dosage is too large, although it can eliminate pathogens and parasites, it will also inhibit the tree. Agents such as antimycin and diflubenzuron can be used, and spraying should be avoided at noon. When spraying, make sure to spray thoroughly and evenly.
4. Selection of bags
Choosing bags is also a matter with some particularities. You should not choose inferior ordinary bags, such as plastic bag types. This is because plastic bags place the fruit completely in a sealed environment with extremely poor permeability, neither allowing ventilation nor water permeability. The respiration of the tree and water evaporation will produce a large amount of water, which cannot flow out and can easily lead to fruit rot. Plastic bags also very easily stick to the fruit, causing sunscald and so on. For bagging, double-layer paper bags should be chosen, as they have strong permeability and can also effectively prevent and control pests and diseases.
The above are some precautions before bagging grapes. Bagging can improve the quality of grapes. But if management is not done well, it will seriously reduce yields. After bagging, timely topdressing and watering should be carried out, and water and fertilizer management should be done well afterward. This promotes fruit expansion, improves nutrient absorption, and enhances quality. That is all for today's introduction. This article is for reference only. Thank you for reading and supporting us.