Grape bagging can not only prevent and alleviate fruit diseases, but also improve the quality of grapes. It is an effective means of low-cost quality and yield increase. But recently, many fruit growers have reflected why grape bags are still rotten. Many grape growers feel puzzled. What are the reasons why grapes are bagged and rotten? Today, small farmers will take you together to learn.
The time of bagging is not right.
Relatively speaking, bagging is too early and not too early, usually in the period of fruit enlargement. Some grapes have been infected with pathogens late, spraying is difficult to eradicate all, and the pathogens are still multiplying in bags. According to the experiment, the rotten fruit rate was only 2.5% when bagging grapes at the expansion stage, but 17.8% when bagging grapes 20 days later.
The way of bagging is not right.
It is said that bagged grapes should be finished within 6 days after spraying. Practice has proved that after spraying grapes, they should wait for the liquid to be dried and packed tightly. It is best to pack grapes on the same day. If there is no rain on that day and no dew at night, it is also possible to pack grapes in two days. Planting area is large, can be carried out in blocks, according to labor, bagging speed and so on to calculate the number of bags a day, can cover as many bags, spray as many medicines. Do not spray the medicine, do not wait until the liquid is dried, then bag it. It should also be noted that when handling bagging, try to avoid touching fruits with hands, and must fasten the upper lip to prevent rain.
Problems in medication
The timing of medication is very important. It can't be used in dew, in sunshine at noon and in gale. It's better to take medicine from 7:00 to 10:00 in the morning, avoid dew and direct sunlight, and apply medicine evenly, not too much spraying, not to leak out. Grapevine grapes should be sprayed on both sides. The spray nozzle of the sprayer should be finely twisted to make the spray thin and uniform.
Quality of paper bags
Grape bagging has many advantages, such as disease prevention, pollution prevention, bird control and pest control, which can ensure the output and quality of grapes. Buying standard qualified wood pulp paper bags is expensive but safe and insurance. Paper bags made by some irregular manufacturers with inferior paper and paper bags made by newspapers, which have been used once, are liable to cause rotten fruit in the bags.