Pruning Defoliation after freezing is a self-protection measure for woody medicinal trees to resist freezing damage. Defoliation can reduce the abnormal loss of water and prevent the tree from dying due to excessive water loss. Falling leaves after freezing will delay germination. Therefore, when the branches germinate and dead branches can be distinguished, cut off dead branches and diseased and insect branches in time, and keep surviving branches and remaining leaves as much as possible. It is difficult to distinguish dead and alive branches for a while. Can be trimmed in stages. The amount of pruning should be light, the cut should be smooth, and the large cut should be disinfected with 75% alcohol or 0.1% potassium permanganate, and wrapped with a film.
After fertilization and freezing, the tree vigor of woody medicinal materials is generally weak, and the roots of frostbitten trees have poor water and fertilizer absorption capacity. Promote the development of strong new shoots, which is conducive to the restoration of tree vigor. Fertilization is mainly based on nitrogen, phosphorus, and potassium quick-acting fertilizers. It is advisable to spray fertilizer on the leaves after the new shoots appear.
Prevention of pests and diseases Freezing can easily cause branch damage and leaf fall, resulting in bare branches, and more serious pests and diseases will easily appear in the future, such as resinous disease, sunburn cracking skin disease, etc. Therefore, it is necessary to prevent and treat diseases in time after freezing. Bordeaux mixture, carbendazim and other agents can be used to prevent diseases, and dichlorvos and trichlorfon can be used to prevent insect pests.
