The grape fruit farmer letter calls to inquire the author, why does the grape set up the bag also rotten fruit? I answered that the problem is that the bagging technology is not closed.
Bagging time is wrong. Relatively speaking, grape bagging is good as early as possible. However, it does not work too early, and it is usually bagged during fruit enlargement. Set too late, some grapes have been infected with pathogens, spraying is difficult to eliminate, and still grow in the bag. According to the experiment, in the bagging period of fruit enlargement, the rate of rot fruit in grapes was only 2.5%, while in the case of 20 days of late set, the rot fruit rate was 17.8%.
The bagging method is wrong. Some people say that grape spears can be finished within six days after spraying, but it is not. Should be sprayed on the grapes, until the liquid to dry tight clutch bag, it is best to finish the day. If the weather does not rain, there will be no dew in the evening and it will be finished within two days at the latest. If the area of ​​the vineyard is large, it can be divided into blocks. According to the labor force, bagging speed, etc., the number of bags to be bagged each day can be calculated. Avoid liquid medicine after spraying is not dry, so it is easy to cause rotten fruit. It should also be noted that when bagging, avoid touching the fruit by hand, and must be tightly sealed to prevent leakage.
There was a problem in the fight. First, it is not right to fight drugs. Do not fight drugs when there is dew, big sun, or windy wind. It is best to fight drugs from 7 to 10 in the morning. Second, fight drugs should be uniform, not too much spray, but can not miss the spray. Sheds must be sprayed on both sides of the fence, and shelving must be sprayed on both sides. The third is to spray a good drug, such as mancozeb, thiophanate-methyl, DuPont Fuxing, etc., do not spray fake drugs. When spraying, the nozzle of the sprayer should be chosen to be fine, which will help spray fine and uniform.
Paper bag quality problems. The price of grape paper bags for bagging is generally 1 to 1.5 times that of ordinary paper bags. It is necessary to buy a qualified wood pulp paper bag, although it is expensive, but it is safe. Some paper bags made by inferior manufacturers with inferior quality paper, paper bags made with newspapers, and once-used paper bags can cause rot in bags.
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