Apple bag easy-to-emerge problems and ways to overcome it

First, give the fruit of poor quality, such as apple trees in the valleys, plateaus, etc., that are not watered, and the results are weak trees. The general fruit is small, irregular, yellow, easy to return sugar, Poor taste, hard and astringent flesh, fail to achieve the desired effect, and consideration should be given to whether these should be bagged.

Second, the use of inferior bags without the national trademark registration of poor quality paper bags and plastic film bags, light, air permeability, water permeability, poor temperature, humidity stability, plastic bags do not anti-aging, paper bags stormy weather, bagging effect Often worse than not bagging, do not use it.

Third, the young fruit period, the occurrence of burning fruit, fruit drought, high temperature, poor ventilation of the plastic film bag or paper bag, prone to sunburn fruit. 2-5 days after bagging is the sunburn peak. Bagging early, Sunburn heavy. Watering before bagging, using orchards with good quality bags, there are very few sun-burning fruits.

IV. Calcium deficiency disorders, black spot disease aggravate all dense planting gardens with excessive nitrogenous fertilizer, vigorous tree vigor, few fruit retention, and canopy closure. Occurrence of bitter pox, pox spot disease (calcium deficiency syndrome) and black spots in bagged fruits Red dot disease (dotted leaf spot disease, mycotic heart disease bacteria infection fruit surface) are more serious. Spraying 3 times of highly effective Merrill calcium and spraying 2 times of multi antibiotics within 40 days after young fruit formation is the key to control.

V. Fruit rot in the bag Fruit rot in the bag is due to a special drug such as thiophanate-methyl that does not spray against rotenus rot before bagging. The later the bagging, the higher the rate of rot fruit. Therefore, special drugs must be sprayed before bagging, and bagging should be done as soon as possible.

Sixth, the main reason for pests entering the bag is that the insecticide has not been laid before bagging; The main insects that enter the bag include Tenebrio molitor, Pterophylla scale insects, aphids, and leaf curlers. The best way to prevent and control is to spray bio-insecticides and diflubenzuron insecticides before bagging, and seal the bag tightly.

7. The main reason for the rough peel of the peel is that the outer paper bag breaks after rain, and even when the bag is cloudy or covered with water and the air permeability is poor, the paper bag dries slowly after absorbing water, or the water in the bag does not dry for a short time, and the humidity in the bag changes too much. Caused. The solution is to strictly seal the mouth of the bag, consider cutting the two lower corners as appropriate during the rainy season.

Eight, the fruit does not shrink in the bag performance in dry days, weak trees do not water the orchard. In particular, the outer layer of paper is thick and resistant to rain, and the inside is a non-calendered black paper double-layer paper bag. The temperature in the high-temperature weather bag is above 50°C. There is no moisture in the bag on weekdays, and the water in the fruit flows back to the blade, causing the fruit to shrink. not long. Therefore, do not put wet and dry trees in the drylands, do not use purple and red plastic bags, and be careful not to use double-layer paper bags with inner layers that are not calendered black paper.

Nine, poorly shaded or dark red dense planting garden canopy closure, excessive application of nitrogen fertilizer Wang tree, sets of poor light transmittance paper bag, bagging too late, the fruit is difficult to green, after the bag is difficult to color. Set of plastic bags with high air permeability and no UV conversion agent, the fruit is easy to be purple, the background is yellow, and it is easy to return sugar, and the bag is easily broken. The solution is to strengthen the management of orchards so that the orchards are well ventilated and light-transported, with reasonable fertilization and high-quality bags as soon as possible.

Ten, after the bag is easy to wilt intolerance after storage Bagging after fruit bag, due to the thin wax layer of the peel, the fruit is easy to wilt during storage. Sets of paper bags should be taken out of bags about 15 to 20 days before harvesting and grading as soon as possible after harvesting. Fruits that are prepared for long-term storage should be wrapped with fresh-keeping paper or plastic film storage bags. The fruit of the plastic film bag can be harvested and bagged, and when it is exported, the original bag can be taken off and replaced with plastic wrap plastic film fresh-keeping bag.

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