When is the right time to bag the grapes and when is the best time to remove the grapes?

Grape bagging time: grapes cultivated in open field in southern China can be bagged in time after fruit setting and fruit thinning, while grapes cultivated in greenhouse and rain shelter can be bagged 15-20 days after fruit setting. Grape picking time: traditional bagging can be picked 10-15 days before harvest, while intelligent daylight bagging can be sold directly with bags.

Time for bagging grapes

1. It is necessary to choose the appropriate bagging time according to different cultivation methods. Generally, grapes cultivated in open field in southern China should be bagged sooner rather than later, and they can be bagged in time after whole ear and thinning fruit. Late bagging is easy to be infected by anthracnose and other pathogens.

2. Grapes cultivated in greenhouse and shelter from rain can generally postpone bagging time appropriately, during which bagging can be carried out in the physiological drop of grapes, that is, 15-20 days after fruit setting, that is, when the fruit grows to the size of bean grains, bagging immediately after thinning grains and whole ears. If there is no time for bagging at this time, bagging can be done before the second expansion period of berries, and the bagging time can be chosen at 9-11:00 in the morning and 2-6 o'clock in the afternoon.

Second, the method of bagging grapes

1. First, soak the mouth of the paper bag into 5-6 cm of water, wet it to make it soft, so that it is easy to tie the mouth of the bag tightly. When bagging, you can open the mouth of the bag, and then put all the ears into the bag from the bottom up. Then the mouth of the bag will be contracted together from both sides and concentrated on the handle of the fruit. It needs to be close to the new tip, and the bare handle should be as little as possible. During this period, the mouth can be tightly fastened with the thin iron wire carried on the bag.

2. Leave a paper bag 1-1.5 cm above the wire thread. Generally, you need to cover the bag immediately after spraying dry water, and you need to cover it within 2 days, and spray the medicine once more, but the interval should not be too long, too long will lead to ear susceptibility, rotten fruit will appear in the bag, try to avoid touching and kneading the ear with your hands when bagging.

Third, grape bag picking time

1. If traditional bagging is generally used, grape varieties should be removed 10-15 days before harvest, which is conducive to improving light and air permeability conditions to promote fruit coloring, while intelligent daylight grape bagging is not so tedious and can be colored directly with bags. and the ripening speed is relatively fast, can be listed in advance, is conducive to improve economic benefits.

2. The bags can be sold with bags during the period, so that they are truly green, healthy and pollution-free. In order to avoid the harm of birds, insects and air pollution, the traditional bagging can not remove the fruit bags at one time, but first open the bottom and hold it up in the shape of an umbrella, and then remove it all at the time of harvest.

IV. Management techniques after picking bags of grapes

1. After picking the bag to before harvest, the main purpose is to make the berries colored. After picking the bag, the old leaves, diseased leaves and residual leaves around the ear should be removed, the redundant branches and secondary shoots should be cut off, and the leaves within 20cm around the ear should be removed.

2. Generally, there is a sieve-like light and shadow in the lower part of the shelf surface, which is beneficial to shading the ear, preventing the sunburn of the fruit, turning the ear in time, ensuring the light, and promoting the ear to be colored quickly.