The grapes are bagged and rotten fruit occurs. The problem is that the bagging technique is not good enough. The main reasons are as follows:
1. The bagging time is wrong. Relatively speaking, the bagging should be early but not too early, generally in the fruit expansion period. Set late, some grapes have been infected with germs, it is difficult to eradicate all the grapes, the germs are still multiplying in the bag. According to experiments, the rotten fruit rate of grapes during bagging during the expansion period is only 2.5%, while the rotten fruit rate of bagging 20 days later is 17.8%.
2. The bagging method is wrong. Some people say that bagging of grapes should be finished within 6 days after spraying, but this is not the case. Practice has proved that after the grapes are sprayed, you should wait for the liquid to dry, hold the bag tightly, and finish it on the same day. If there is no rain on the day and no dew at night, it can be done within two days. The planting area is large and can be divided into blocks. According to labor and bagging speed, calculate the number of bags per day, and spray as much medicine as you can cover. Don't bagging after spraying the medicine without waiting for the liquid to dry, as this will easily cause rotten fruits. It should also be noted that when bagging, try to avoid touching the fruit with your hands, and be sure to tie the upper mouth tightly to prevent rain from leaking.
3. There is a problem in spraying medicine. The timing of spraying is very important. You cannot spray when there is dew, or when the sun is shining at noon or when there is strong wind. ****** Spray the medicine between 7 am and 10 am, avoid dew and direct sunlight; spray the medicine evenly, do not spray too much, let alone miss the spray. The grapes on the fence should be sprayed on both sides, and the ears on the trellis should be sprayed on both sides. The spray nozzle of the sprayer should choose a thin rotary piece, which is conducive to fine and uniform spraying.
4. The quality of paper bags. Grape bagging has many advantages, such as disease prevention, pollution prevention, bird damage prevention, and insect pest prevention, which can ensure the yield and quality of grapes. Buy standard wood pulp paper bags, which are expensive but safe and safe. Some informal manufacturers use low-quality paper to produce paper bags, self-made paper bags for newspapers, and paper bags that have been used once, which can easily cause rotten fruits in the bags.
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