In recent years, sweet cherry winter frost has occurred due to climate anomalies. Sweet cherries are not resistant to severe cold. When winter falls to -20 °C, flower buds and branches are subject to freezing damage. Below 25 °C, tree death will occur. Therefore, the focus of winter sweet cherry management is that the trees are winter and cold, and attention is paid to prevention and control. Overwintering pests and diseases provide guarantee for the safe wintering of trees, the growth of trees in the next year and the formation of yield.
1. Top dressing before defoliation
The external top dressing has the advantages of being simple and easy to use, using less fertilizer, and exerting a quick effect. According to the study, 50% to 75% of nitrogen is returned to the tree before the leaves fall off; spraying 0.8% to 1% of urea on the leaves of the tree 2 weeks before the leaves can accelerate the return of nutrients in the leaves and increase the tree body. Store nutrient levels to improve the ability of flower buds and trees to resist freezing.
2, the branches are painted white
Whitening the trunk can reduce the damage of sweet cherry caused by freezing damage in winter, and can cover the wound and avoid the invasion of bacteria. The white coating is generally carried out in the late autumn after the leaves of the tree. Before the white coating, the old skin is scraped off, and the main body of the lower part of the tree below 1 m and the base of the main branch are painted white, especially the branches. 8 to 10 parts of quicklime, 1 part of stone sulphur mixture, 1 part of salt, 20 parts of water, and a small amount of animal oil vegetable oil. When disposing, first use a small amount of water to separate the salt and quicklime, then add the stone sulphur mixture and oil to mix and mix. Whitening can not only prevent freezing, but also effectively prevent pests and diseases.
3, pouring frozen water
If the autumn is dry, before the freezing of the soil from the end of November to the beginning of December, when the soil is “freezing and freezingâ€, the orchard is filled with frozen water and poured through the root layer. Reducing soil drought, releasing heat when water freezes and cooling, thereby increasing winter temperature, keeping soil temperature relatively stable, reducing the occurrence of frost damage and preventing spring pumping.
4, Qingyuan deep
Before unsealing, by deep-turning the tree tray, the cockroaches or adults of the wintering insects such as the heartworm are exposed to the surface and killed by the low temperature in winter. After the fallen leaves, the leaves and weeds should be removed in time, the pests and branches should be cut off, and removed from the garden for deep burial or burning.
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