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Pruning the frozen leaves is a self-protection measure for the woody herbs to resist the freezing damage. The leaves can reduce the abnormal loss of water and prevent the trees from dying due to excessive water loss. After freezing, the leaves will delay the germination. Therefore, when the branches are germinated and the dead branches can be distinguished, the dead branches and the diseased branches are cut off in time, and the living branches and the remaining leaves are kept as much as possible. It is difficult to distinguish the dead branches for a while. It can be trimmed in several steps. The amount of trimming 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 film.
After fertilization and freezing, the roots of woody herbs are generally weakened. The roots of frostbite trees have poor water absorption and poor ability to absorb fertilizer. Therefore, woody herbs should be topdressed after rooting. Fertilization should pay attention to light application, thin application and multiple application. Promote the development of thick and new shoots, which is conducive to restoring the tree potential. Fertilization is mainly based on nitrogen, phosphorus and potassium quick-acting fertilizers. It is advisable to spray fertilizer on the foliar surface after the new shoot occurs.
Prevention of pests and diseases Ice is easy to cause damage to branches, leaves, leading to exposed branches, and it is easy to appear more serious pests and diseases in the future, such as resin disease, sunburn disease. Therefore, it is necessary to prevent diseases and treat diseases in time after freezing, and to use drugs such as Bordeaux mixture and carbendazim to prevent and treat diseases, and to control insects and insecticides such as dichlorvos and trichlorfon.
Source: Anhui Daily Rural Edition
Woody herbs should be trimmed and fertilized after freezing
In the middle and late January of this year, many provinces in China suffered from long periods of rain and snow, which caused serious damage to woody herbs. In order to reduce losses, the following management must be strengthened in time:
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