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 for more than 110 days.
Bagging method: Before bagging the apple, first open the bag to make the paper bag expand, and at the same time open the lower vent hole to prevent the sunburn of the paper bag near the fruit surface, and then put the young fruit into the bag to let the fruit 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 added 2-3 times before apple bagging. If calcium fertilizer is sprayed 1-2 times before bagging, it needs to be sprayed once again 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. It should be corrected at any time. After windy, rainy, 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 high temperature 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;
Unsuitable ring peeling after bagging: After peeling apples, tree ring peeling will lead to weakening of the tree, prone to black spot disease, water heart disease and so on. Moreover, the fruit becomes smaller, the hardness decreases, the coloring is poor, and sunburn is easy to occur. Therefore, the measures to promote the flowering of bagged apple trees are better for ring cutting, branching, twisting and topping.
Strengthen pest control: bagged apples must protect their leaves during growth. Diseases are mainly early deciduous diseases, and pests are mainly leaf-eating pests such as gold moth, red spider, etc. The bactericidal and insecticides are selected from DuPont eBaoTech, Antaisheng, tebuconazole, difenoconazole, lambda-cypermethrin, perchlormethrin, and avermectin.
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