Zanthoxylum bungeanum freeze injury refers to the sharp drop in temperature caused by extreme weather during the overwintering period or the tender shoots of spring Zanthoxylum bungeanum. The temperature of the whole or part of the tree body drops below the freezing point, and the intercellular freezing causes tissue damage or death of the Zanthoxylum bungeanum tree. Freezing damage mainly includes two major categories. One type occurs during the overwintering period and is caused by intense cooling or continuous low temperature. This type of freezing damage is mainly manifested in the freezing damage of trees, branches and roots. Among them, the freezing damage of branches and trunks poses a great threat to production and has an impact wide range.
Precaution
Before the arrival of the cold current, emergency precautions can be taken to increase the temperature of the pepper garden to protect the pepper from freezing damage, and to alleviate the adverse effects of the sharp cooling or heating on the pepper trees, thereby avoiding or reducing the freezing damage.
1. When building a pepper garden in a scientific way, you must first choose frost-resistant Zanthoxylum bungeanum varieties, and investigate the extreme low temperature in the local area, and choose fields with fertile soil, gentle slopes and sunny leeward.
2. Strengthen field management After harvesting and the later period of growth, pay attention to timely fertilization, control the use of nitrogen fertilizer, increase the application of phosphorus and potassium fertilizer, do a good job in the prevention and control of diseases and insect pests, and enhance the tree vigor.
3. The main methods of tree body overwintering protection include tree tray soil cultivation, tree trunk whitening, tree trunk wrapping, spraying insulation agent, etc.
Remedy
Remedial measures should be taken as soon as possible after freezing damage occurs, especially when tree trunks appear freezing damage, water or growth regulators should be sprayed in time to ensure adequate water in the early stage and supply nutrients to ensure the restoration of tree vigor. Before and after germination, cut the tops of the frozen and dead trees, and apply protective agents to the wounds after cutting to reduce the evaporation of water, prevent pests and diseases, and enhance the resistance of the tree.
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