Causes and Preventive measures of Frost injury of Zanthoxylum bungeanum

The freezing injury of Zanthoxylum bungeanum occurs frequently in winter and spring, but because of the backwardness of farmers' prevention technology, a large area of pepper is frozen, which seriously affects the development of pepper industry. So what are the causes of pepper frost injury? How to prevent it? Come and have a look with the editor.

1. Causes of frost injury

During the period of overwintering or during the tender shoot in spring, because the extreme weather causes a sudden drop in temperature, all or part of the temperature of the tree falls below the freezing point, causing damage to crops, because the inhibition of intercellular freezing leads to the death of pepper tissue. The frost injury of Zanthoxylum bungeanum is mainly divided into two categories, one is the freezing injury caused by sharp drop in temperature or continuous low temperature during the overwintering period, which is mainly manifested in the tree body, branches and roots, among which the freezing injury of branches is the most harmful. The other is that during the alternation of autumn and winter or winter and spring, the frost caused by severe cooling mainly harms the branches, inflorescences and roots. Cold air attacks in late winter and early spring often lead to reduced yield or no harvest of Chinese prickly ash.

2. Preventive measures of frost injury in winter

First of all, the varieties with strong anti-freezing ability should be selected in the construction of the garden, and the fields with fertile soil, gentle slope and sunny leeward should be selected according to the local extreme weather. Apply fertilizer in time after harvest and later growth of Zanthoxylum bungeanum, control the amount of nitrogen fertilizer, increase the application of phosphorus and potassium fertilizer, do a good job in pest control and enhance the tree potential. Before overwintering, some methods can be taken to prevent cold and heat preservation, such as cultivating soil on tree plates, painting tree trunks with white, covering tree trunks with grass, spraying heat preservation agents and so on.

3. Precautions against cold snap in spring

Before the cold spell in spring, it is necessary to take emergency preventive measures to increase the temperature in the pepper garden, so that the vulnerable parts of pepper are on the critical temperature to avoid frost damage. The young trees of Zanthoxylum bungeanum can be bandaged with rice straw or crop straw to keep warm and cold before overwintering, and the soil water content should be changed by irrigation 2-3 days before frost. adjust the change of tree temperature near the ground and reduce the degree of freezing damage caused by drastic changes in temperature. Smoking in the pepper garden can raise the temperature by 1-2 degrees, but be careful not to ignite an open fire.

4. Remedial measures

After the freezing injury of Zanthoxylum bungeanum, timely measures should be taken to remedy it, especially when the tree trunk appears frost injury, it is necessary to irrigate or spray growth regulators in time to ensure sufficient fertilizer and water in the early stage and the restoration of tree potential. For the frozen branches, the dead parts can be cut off before and after sprouting, and the wound protective agent can be applied after pruning to reduce water transpiration, prevent the invasion of diseases and insect pests and enhance the stress resistance of the tree.

The above is the introduction of the causes and preventive measures of pepper freezing injury. I hope it can help you. If you want to know more about it, please follow us.