When do grapes usually be bagged? How much is it? What kind of medicine should I take before bagging? What are the technical points?

Grape fruit bagging cultivation can improve the smoothness of fruit surface and improve the coloration. As an important technical measure of pollution-free fruit, it has been widely used in production. So when are the grapes bagged? How much does one cost? What medicine should be applied before bagging? What are the technical points? According to Changsha grape planting base, grape bagging should be selected according to varieties and different climatic conditions in different regions. Different specifications of the bagging price is different, generally in a few cents a.

When are grapes bagged?

Grape bagging period generally starts immediately after fruit setting is stable, whole ears and thinning, and ends before rainy season to prevent early infection diseases and prevent sunburn. To avoid high temperature weather after rain or rain after a sudden sunny weather bagging, generally after 2-3 days, to be slightly adapted to the high temperature environment after the fruit bagging.

What medicine to hit before grape bagging?

1. Before bagging, the orchard should be sprayed with fungicides in an all-round way, focusing on spraying ears, and bagging should be carried out after the liquid medicine is dried. Immerse the bag mouth end 6-7cm into water to make it wet and soft, so as to shrink the bag mouth. When bagging, first open the paper bag with your hands, so that the paper bag bulges, and then from bottom to top the whole ear all set into the bag. Then shrink the bag mouth to the ear handle and tighten it with one side of the sealing silk. Above the iron wire to leave a 1-1.5cm paper bag, bagging is strictly prohibited to rub the ears with hands.

2. After spraying grapes, hold on to bagging after the liquid medicine dries, preferably on the same day. If it does not rain and there is no dew at night, it will be completed within two days at the latest. The vineyard area is large, can divide the block to carry on, according to the labor, bagging speed and so on calculates a day bagging quantity, can set how many, sprays how many medicine. Do not spray after the liquid is not dry bag, this is also easy to cause rotten fruit. It should also be noted that when bagging, try to avoid touching the fruit with your hands, and be sure to tighten the upper mouth to prevent leakage of rain.

3, can not be in the dew, the sun, blowing strong wind when the medicine, it is best to apply medicine at 7~10 a.m.; the medicine should be uniform, not too much spray, not to mention leakage spray. Spray grapes on both sides of the fence, and spray both sides of the trellises; spray drugs with good efficacy, such as mancozeb, methyl thiophanate, Du Pont Fuxing, etc., and never spray fake drugs. When spraying, the spray nozzle of the sprayer should select fine rotating tablets, which is conducive to fine and uniform spraying.

What are the technical points of grape bagging?

1, do a good job before bagging management work. 1. Fertilize according to soil fertility;2. Water the orchard once before bagging, and start bagging after the ground is dry; 3. Spray the grape to be bagged once with fungicide, which can be 800 times of 70% thiophanate methyl and 800 times of 40% stable bacteria. 4. To improve grape quality by thinning out small grains, defective grains, abnormal grains, etc.

2, choose the right paper bag. According to the microenvironment of grape growth, ear shape and size of grape varieties, paper bags with strong wind and rain resistance, good air permeability, high transparency, high hydrophobicity and antibacterial characteristics were selected.

3. Bagging in time. Bagging time is selected around the middle of June, before 10:00 a.m. or after 4:00 p.m. When bagging, open the bag mouth with your right hand, hold the bottom of the bag with your left hand, open the ventilation and drainage ports on both sides of the bottom of the bag, pull up the bag from bottom to top, put the fruit handle on the notch above the bag, make the ear located in the center of the bag, and tie the bag mouth tightly with iron wire.

4. After bagging, pesticides for fruit diseases and insect pests can no longer be sprayed, and the focus is on controlling diseases and insect pests of grape leaves such as leafhopper and downy mildew. Corn weevil, herbage insect, Mealybug Connolly, Thrips theae and other pests that are easy to enter the bag should be closely observed, and when the damage is serious, the bag can be released and sprayed. The medicament can be used 2000-3000 times 50% of ocrine emulsifiable concentrate, 1200-1500 times 48% of Lesben, etc.

5. Grapes can be bagged and harvested, or bagged about 10 days before harvest. Red varieties can be de-bagged about 10 days before harvest to increase fruit exposure and promote good coloring. Giant bees and other varieties generally do not need to remove bags, but can also be achieved by batch bag removal method to achieve the purpose of harvest by stages. In addition, if the paper bag used has a high transmittance and can meet the requirements of coloring, it can also be used without bag to produce clean and pollution-free fruit. Grape to bag, do not remove the fruit bag at one time, should first open the bottom of the bag, let the fruit bag cover the upper part of the cluster, in case of bird damage and sunburn. The bag removal time should be carried out before 10 a.m. or after 4 p.m. on sunny days, and can be carried out all day on cloudy days.

6, grapes to the bag after generally do not have to spray, but must closely observe the fruit coloring progress. After removing the bag, some aged leaves near the ear and over-dense branches on the shelf surface can be cut off to improve the ventilation and light transmission conditions of the shelf surface, reduce the damage of diseases and insect pests, and promote fruit coloring. However, it is necessary to pay attention to not picking too many leaves too early. It is worth pointing out that leaf picking should not be carried out at the same time as bag removal, but should be carried out in stages and batches to prevent sunburn.