The grapes still rot after being bagged, and the problem lies in the inadequate bagging technique. There are mainly the following reasons:
Bagging time
The bagging time is relatively incorrect. Bagging should be done early but not too early, usually during the fruit swelling period. If set late, some grapes have already been infected with bacteria, and spraying cannot completely eradicate them. The bacteria are still reproducing inside the bag. According to the experiment, during the swelling period, the grape rot rate is only 2.5% when bagged, while after 20 days of bagging, the rot rate is 17.8%.
Bagging method
The bagging method is incorrect. Some people say that bagging grapes should be done within 6 days after spraying, but it is not the case. Practice has proven that after spraying grapes with medicine, they should wait for the medicine to dry, tightly wrap them in bags, and finish covering them on the same day. If there is no rain on the same day and no dew at night, it can also be covered within two days. The planting area is large and can be divided into blocks. Based on labor, bagging speed, etc., calculate the number of bags to be bagged per day. Spray as many bags as can be bagged. Do not put the medicine in a bag without waiting for it to dry after spraying, as this can easily cause rotting of the fruit. Please also note that when bagging, try to avoid touching the fruit grains with your hands and make sure to tightly tie the upper opening to prevent rainwater.
Problems occurred during the medication process
The timing of medication is very important. It should not be applied when there is dew, or when the sun is shining at noon or when there is strong wind. Apply the medicine from 7am to 10am, avoiding dew and direct sunlight; The spraying should be uniform, without excessive spraying or missed spraying. Vine trellis should be sprayed on both sides, and greenhouse trellis should also be sprayed on both sides of the fruit clusters. The nozzle of the spray should choose a fine rotary vane, which is conducive to fine and uniform spraying.
Paper bag quality issues
Grape bagging has many benefits, including disease prevention, pollution prevention, bird and pest control, which can ensure grape yield and quality. Buy standard and qualified bags, expensive but safe and secure.
For example, Nongfu Yipin Grape Bags and Nongfu Yipin Ecological Film Grape Bags are made of polymer materials, which have excellent characteristics such as rain resistance, breathability, insect resistance, bird resistance, and light transmission.
Improvement methods
Research has shown that it can effectively improve the micro environment for grape ear growth, increasing glucose levels by 3 to 5 degrees. Increase the content of anthocyanins, vitamin C, etc., improve the comprehensive fresh quality of grapes, and enhance the brightness of grape fruits and surfaces.
1. Excellent breathability, with a temperature difference controlled at around 2 ℃ between the inside and outside of the bag, to prevent direct sunlight from burning the fruit.
2. 86% light transmittance, excellent light transmittance performance, uniform coloring of grape fruit, can be launched early to increase selling price.
3. Antibacterial, unique sealing design, effectively controls the growth of environmental bacteria.
4. Bird proof, high toughness molecular material, can effectively prevent birds from pecking at fruit grains, very durable.
Some informal manufacturers produce paper bags with inferior quality paper, paper bags made from newspapers, and paper bags that have been used once are prone to rotting inside the bags.
Dongguan Liansheng Non woven Technology Co., Ltd. was established in May 2020. It is a large-scale non-woven fabric production enterprise integrating research and development, production, and sales. It can produce various colors of PP spunbond non-woven fabrics with a width of less than 3.2 meters from 9 grams to 300 grams.
Post time: Aug-31-2024