There are fruit farmers who ask if the grapes that have been bagged are rotten and rotten. The author believes that there are mainly the following reasons. 1. The bagging time is wrong. Relatively speaking, bagging should not be premature, and it is generally set during the expansion period. Set too late, some grapes have been infected with pathogens, spraying is difficult to eradicate all, and still grow in the bag. According to the experiment, the bagging rate during the expansion period was only 2.5% for the grapes, and 17.8% for the bagged bags in the late 20 days. 2. The bagging method is wrong. It has been claimed that bagging grapes must be completed within 6 days after spraying, but it is not. Practice has proved that after the grapes are sprayed and the liquid is allowed to dry, it is necessary to grasp the bag tightly. It is best to finish it on the same day. If there is no rain on the day and there is no dew at night, it can be done within two days. The planting area is large and can be divided into blocks. According to the labor force, bagging speed, etc., the number of bags to be bagged per day can be calculated. 3. There is a problem in fighting drugs. The wrong time to fight drugs, can not fight drugs when there is dew, can not fight drugs at noon when the sun is shining and blowing winds. It is best to fight drugs from 7 to 10 in the morning to avoid dew, avoid direct sunlight, fight evenly, do not spray too much, and do not spray. The trellis must be sprayed on both sides of the trellis and the trellis must be sprayed on both sides of the trellis; spray medicines such as mancozeb, thiophanate methyl, and Dupont Fuxing. Do not use counterfeit medicine. When spraying, the nozzle of the sprayer should be chosen to be fine, which will help spray fine and uniform. 4. Paper bag quality problems. Grape bagging has many advantages, such as disease prevention, pollution prevention, bird-fighting, and pest control. It can guarantee grape yield and quality. The price is generally 1 to 1.5 times that of bagging, and it is popular. Buy standard qualified wood pulp paper bags, expensive but safe and safe. Some poor quality paper bags produced by informal manufacturers, paper bags made by newspapers, and paper bags that have been used once can cause rot in bags.
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