Key points of safe wintering maintenance of trees in autumn;
1, pour antifreeze. We know that the whole growth process of garden trees is inseparable from water. In winter, the temperature is low and the evaporation is small, but irrigation is also needed. Especially in autumn, trees, especially newly planted trees, should be watered at the beginning of 1 1. That is, pour antifreeze water, and then combine it with frozen water to cultivate mounds at the base of the tree. This not only supplies the water needed by the trees themselves, but also improves the cold resistance of the trees.
2. Prune during hibernation. In winter, most trees go dormant, but they also need pruning. On the one hand, it strengthens the future growth, on the other hand, it promotes the rejuvenation of trees and the remodeling of crown. There are two main pruning methods: pruning by branches and truncation.
3. The trunk is painted white. The function of whitewashing is to reduce the local temperature rise of branches and prevent the harm of sunburn by reflecting sunlight, and at the same time, whitewashing also has the function of preventing and controlling pests and diseases. Paint the lower parts of the trunk and main branches evenly. Whitening is effective twice, once in late autumn to early winter and once in late winter to early spring. When painting the trunk, it is advisable not to flow, tilt and fall off after drying. Whitening should be carried out in sunny days, which will reduce the effect in rainy and snowy weather.
4. Apply manure. Applying 5- 10 cm of cattle and horse manure into the tree tray can effectively raise the soil temperature, prevent freezing injury and reduce the occurrence of dried bamboo shoots in spring.
5. Set up a wind barrier. Edge tree species such as Buxus macrophylla and Magnolia grandiflora can keep out the cold by erecting a wind wall, which is 50 cm higher than the tree and wider than the tree.
6. Wrap a straw rope. Twisting the tree with straw rope can prevent direct sunlight and wind from blowing on the tree, thus reducing the transpiration of the tree. This method is mostly used for some trees with weak cold tolerance, such as Magnolia grandiflora and Changshan Mountain in Haizhou. Or new trees planted in autumn.
7. Cover the bushes with film. For some low shrubs, two flexible bamboo strips (about 3 cm wide) can be sharpened at both ends and inserted crosswise at the four sides of the plant, and the distance between the top and the crown of the plant should be kept at about 15 cm, then covered with agricultural film and then covered with soil. This method can be used for cold protection of low shrubs such as Rose, Ligustrum lucidum and Euonymus Jiaodong.
8, pest control. The severe cold season in winter is the key period for pest control. Many germs and pests that harm green seedlings spend the winter in dead branches and weeds, and then go to trees to breed in the next year. The overwintering sites of pathogens such as brown spot disease and gray spot disease are all in litter and weeds; Most of the pathogens of anthracnose overwinter on residual fruits. Therefore, it is necessary to clean up the seedlings and their nearby dead branches, fallen leaves and other debris, combine with winter pruning, cut off the branches of pests and diseases, concentrate on retting or burning, completely eliminate overwintering pests and diseases, and cut them off from the source.