Apple bags must be carefully managed

First, fine fruit thinning: Artificial fruit thinning begins 7-10 days after flowering and is completed within one month after falling. 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.

Second, fine bagging: (1) Tsugaru, Dora, the United States and other early-maturing varieties can be bagged 10-15 days after flowering. Red Fuji apples are bagged 15-20 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 10-15 days and then set the low-price double-layer paper bag, generally grasp the paper bag work completed in early July.

(2) 2-3 days before bagging, sterilizing insecticides and calcium fertilizers are carefully sprayed. Focus on the results, the degree of atomization is high, and heavy spraying is required after spraying. 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 is 3-4 times, and the amino acid calcium fertilizer is sprayed 2-3 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 was completed in mid-June, a 1:2:200-240 Bordeaux mixture was sprayed on the tree, which has a significant preventive effect on diseases such as early defoliation and ring rot.

Third, grasping fertilizer water: fruit bagging period is the young fruit development period, good fertilizer and water management is conducive to the development of young fruit, increase fruit, but also can prevent and reduce the incidence 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 mid-June, fertilizer is generally applied, followed by 15% compound fertilizer of nitrogen, phosphorus, and potassium, and 50-75 kg of fertilizer per mu. At the same time, combined with the spraying of foliar fertilizer, such as 0.3% urea, amino acid micro-fertilizer and so on.

Fourth, repair trees

(1) In the middle or late May of the same period, main or main branch girdling of apple trees such as Zhuangwang and Fujia anthracoflorous long-branched red Fuji trees is strictly prohibited. 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. Wang Tzu can cut 2-3 lines at the base of the branches in mid-May at an interval of 2-3 cm to slow down its growth potential and promote flower bud differentiation.

(2) To remove excessive and dense fruitless shoots, to eliminate the sprouts at the large cut slash, to erect excessive shoots on the shoots, and to erect excessive shoots at the top of the shoots, and to eliminate the sprouting of the main base. Be careful not to over pruning in summer, 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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