Bagging time: Generally about 45 days after Xie Hua, that is, bagging will begin half a month after fruit thinning. Early-maturing varieties generally grow in bags for about 70 days, medium-maturing varieties for about 90 days, and late-maturing varieties should generally be more than 110 days.
Bagging method: Before bagging the apple, first stretch the bag to expand the paper bag, and at the same time open the lower vent to prevent sunburn when the paper bag is close to the fruit surface, and then put the young fruit into the bag to keep the fruit in place At the center of the paper bag, tie the top of the paper bag tightly so that the fruit stand and leaves are exposed outside the paper bag. When using double-layer bags, do not tie the iron wire to the fruit handle, as the wind and rain may damage the fruit handle and cause fruit drop.
Calcium supplementation in time: bagged apples are prone to black spot disease and acne disease from before bagging to after bag picking, which affects fruit quality and storage performance. Calcium fertilizer should be supplemented 2 to 3 times before apple bagging. If the number of calcium fertilizer spraying before bagging is 1 to 2 times, another spraying is required after bag removal.
Regular inspection after bagging: It is found that the wire tie of the bag is naturally loosened, the bag is dropped, and the bag is leaked. After windy, raining and spraying, you should check it frequently to prevent the paper bag from sticking to the fruit surface, affecting ventilation and drainage to avoid sunburn.
Appropriate thinning: In the hot and dry summer and autumn, the branches on the back of the apple tree and the dense inner bore should be properly cleared, but not too much; when the apple is ready to remove the bag, appropriate thinning will be carried out about a week before.
It is not advisable to ring peel after bagging: the ring peeling of the tree body after bagging of apples will lead to the weakening of the tree, which is prone to black spot disease and water heart disease. Moreover, the fruit becomes smaller, the hardness decreases, the coloring is poor, and sunburn is easy to occur. Therefore, the measures of bagging apple trees to promote flowering are better than ring cutting, branching, twisting, and topping.
Strengthen the prevention of diseases and insect pests: During the growth of bagged apples, the leaves must be well protected. The diseases are mainly early deciduous diseases, and the pests are mainly leaf-eating insects such as gold moth and red spider. The bactericidal and insecticides are selected from DuPont eBaoTech, Antaisheng, tebuconazole, difenoconazole, lambda cypermethrin, perchlormethrin, and avermectin.
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