Apple fruit bagging period how to manage

First, thinning fruit

Manual fruit thinning begins 7 to 10 days after flowering and is completed within one month after flowering. Early flowering, high fruit setting rate, poor management of fertilizer and water, serious disease, heavy fruiting, and weak tree vigor can be early sparse; varieties with late flowering, low fruit setting, heavy fruit weight, and fruit trees with low fruiting can be appropriate late sparse. When fruit thinning should be selected to leave the fruit shape of the correct center of the fruit, leaving more fruit in the long fruit and fruit growth down the top of the fruit, sparse small fruit, disease and fruit, tip fruit, deformed fruit and fruit stem short and upward growth of the fruit. Red Fuji apple trees generally leave one fruit per 40 to 60 leaves, or 1 fruit every 20 to 25 centimeters, and 1 to 12,000 pieces of fruit per mu. The yield per mu is controlled at 2000 to 2500 kilograms.

Second, fruit bagging

1. The medium-early-maturing varieties such as Tsugaru, Dora, and U.S. 8 can be bagged 10-15 days after flowering. Red Fuji apples are bagged 15 to 20 days after flowering, and bagging is completed before mid-June. Red Fuji apple implements a full set of bag cultivation, which can be combined with paper bags and plastic film bags. The light of the middle of the crown can be better set of paper bags, upper, lower and outer plastic bags. Can also be set first plastic film and then set the paper bag to improve the quality of fruit, the method is the fruit set plastic film bag 10 to 15 days and then set the low-price double-layer paper bag, generally grasp the paper bag work completed in early July.

2. 2 to 3 days before bagging, carefully spray the bactericidal insecticide and calcium fertilizer, focusing on the results, the degree of atomization is high, and heavy spraying after raining. During the bagging period, the focus is on the control of ringworm, brown spot, and calcium deficiency. The type and frequency of medication may be determined depending on the weather conditions. The general year of treatment is 3 to 4 times, and the amino acid calcium fertilizer is sprayed 2 to 3 times with frequent rainfall. , To add a systemic fungicide, to pure powder thiophanate-methyl, carbendazim, bacteria poison clear and so on. When there is less rainfall, it can spray protective fungicides such as Taisheng and Bacteria. At the same time pay attention to pest control, with cotton bollworm, aphids, aphids, leaf miners, leaf roller moth and other pests as the focus of prevention and control, can choose to use pyrethroids, morphine, imidacloprid, diflubenzuron 3, Qi Qi Su and other agents. After the bagging is completed in mid-June, a 1:2:200-240 Bordeaux mixture is sprayed on the tree, which has significant prevention and control effects on diseases such as early defoliation and ringworm disease.

Third, fertilizer and water management

During fruit bagging, it is a young fruit development period. Good fertilizer and water management is conducive to the development of young fruit and the increase of fruits. It can also prevent and reduce the occurrence of fruit sunburn. After flowering, trees with large amounts of flowers, many fruit set-ups and weak trees will be topdressed with urea in time. From late May to early and mid-June, fertilizer is applied once generally, topdressing compound fertilizers containing 15% of each of nitrogen, phosphorus, and potassium, and the amount of fertilizer per mu is 50-75 kilograms. At the same time, combined with the spraying of foliar fertilizer, such as 0.3% urea, amino acid micro-fertilizer and so on.

Fourth, tree management

1. When the shoot length is 15cm or more (usually around May 10th), it sprays 300 times 15% paclobutrazol, which sprays the young shoots on the tree, especially for young trees and small fruit. The tree has to control the growth of new shoots.

2. In the middle or late May of May, major or chief girdling of apple trees such as Zhuangwang and Qiaoqin Long-branch type Fuji can be carried out. The old trees, weak trees, and diseased trees are strictly prohibited from girdling. The twigs Red Fuji and Red Star and other species can be used when the tree is too busy. It can be cut every 10 days, and it can be used for girdling even if it is cut three times. For Wang branch, you can cut 2 to 3 roads at the base of the branches in mid-May at an interval of 2 to 3 centimeters to slow down their growth potential and promote flower bud differentiation.

3, to eliminate excessive, dense fruitless shoots, sparse at the large cut sorghum mouth at the sprouting, excessive shoots on the branches of the erect Wangwang shoots and branches of the top of the upright shoots, remove the main base of the sprouting , Pay attention to the summer must not be too heavy trim, otherwise, weaken the tree. The results of the young sapling tree, from late April to early May, topping the fruit shoots and shoots, has a significant effect on improving the fruit setting rate, especially for Zhuguang and the Marshal cultivar more effective. Changfu No. 2 variety, from the end of May to the beginning of June, left 20 centimeters of a single length of fruit and abutment, and one of the two pairs of fruit trees was removed, and the other one left 20 centimeters to pick up the heart. Increase the effect of fruit.

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