1. Cover the shed in time. Pitaya grown in greenhouses must be covered in winter. It mainly depends on the temperature. When the average temperature of day and night is lower than 20 degrees Celsius, the shelter should be covered in time. To prevent the temperature from being too low to cause harm to the growth of dragon fruit, especially for some fresh shoots, which can cause death in severe cases. Covering the shed can effectively increase the surrounding temperature, which is conducive to the development of tender shoots and the harvest of the last batch of fruits. But also pay attention to the humidity in the shed. Open the shed for ventilation when it is sunny.
2. Apply overwintering fertilizer. After harvesting the fruits, spray overwintering fertilizer in time to improve soil fertility, supplement nutrition for dragon fruit trees, and restore the growth of fruit trees. Ensure that the dragon fruit tree has enough nutrient accumulation to promote the budding of the fruit tree in the second year. It can also improve the resistance of fruit trees, enhance their cold resistance, and promote their successful overwintering. When applying overwintering fertilizer, pay attention to controlling the application amount according to the planting area to ensure adequate nutrition and prevent fertilizer damage to the fruit trees.
3. Clear the garden in time. After harvesting and fertilizing, the branches of the fruit trees that have grown weak and pests should be cut off, and then the branches and fallen flowers and fruits should be taken out of the orchard for burning and deep burying. Then spray disinfectant pesticides throughout the garden to destroy the overwintering sites of pests and diseases, reduce the number of pathogens and eggs, and reduce the incidence of pests.
Finally, apply pine film and other substances to the fruit trees to improve the disease resistance and cold resistance of the fruit trees. Prevent pests from harming the lower stems of the plants.
4. Postpone pruning. Pruning is not suitable in winter, and pruning should be done in early spring as much as possible. Because of the low temperature in winter, pruning may cause the sprouted buds to suffer low temperature damage. Delaying the pruning time can also increase the nutrient accumulation of the tree, which is beneficial to avoid the occurrence of pests and diseases due to pruning wound infection. Therefore, we must prevent mechanical wounds on the tree in winter, which will affect the growth of dragon fruit trees.
5. Disease and pest control. Although the temperature is low in winter, pests and diseases may still occur if management is not done properly. Therefore, in winter, we must do a good job of preventing and controlling pests and diseases to prevent them from reducing the economic benefits of planting. In addition to strengthening management, the orchard should be sprayed and disinfected on a regular basis, and corresponding measures should be taken in time to prevent the spread of the disease and expand the affected area.
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