Key points of winter management of cherry cold-intolerant sweet cherry trees

In recent years, sweet cherries suffer frost injury in winter due to abnormal climate. Sweet cherry is not tolerant to severe cold, and when it falls to-20 ℃ in winter, the flower buds and branches will suffer frost damage, and the trees below-25 ℃ will die; therefore, the focus of cherry management in winter is to prevent cold, and at the same time pay attention to the control of overwintering diseases and pests, so as to provide guarantee for safe overwintering, growth and yield in the following year.

The cherry garden is turned deep.

1. Before defoliation, topdressing outside the root:

Extra-root topdressing is simple and easy, the amount of fertilizer is less, and the effect is fast. According to the study, before the leaves fall off, 50%-75% of the nitrogen is returned to the cherry trees; spraying 0.8%-1% urea on the leaves two weeks before falling leaves can accelerate the return of nutrients in the leaves and increase the nutrition of the trees for storage. so as to improve the frost resistance of flower buds and trees.

2. White the branches and stems:

Trunk whitening can reduce the tree damage caused by low temperature in winter, cover the wound and avoid the invasion of germs. Whitening is usually carried out in late autumn after falling leaves. Before whitening, scrape off the old warped skin, and whiten the trunk less than 1m in the middle and lower part of the tree and 0.3m at the base of the main branch, especially in the twig. The whitening agent was prepared with 8 parts of quicklime, 1 part of stone-sulfur mixture, 1 part of salt, 20 parts of water, and a small amount of animal oil and vegetable oil. When preparing, first use a small amount of water to open the salt and quicklime, then add stone-sulfur mixture and oil, stir and mix well. Whitening can not only prevent freezing, but also effectively control diseases and insect pests.

3. Pour frozen water:

For example, in the autumn drought, before freezing at the end of November to the beginning of December, when the soil was "frozen at night", the cherry orchard was irrigated with frozen water to penetrate the root soil layer. Reduce soil drought, water freezing cooling, release heat, so as to increase the garden temperature, maintain a relatively stable soil temperature, reduce frost damage, prevent spring striping.

4. Deep digging of Qingyuan:

Before freezing, the pupae or adults of overwintering heart borer and other pests are exposed to the surface and killed by low temperature in winter. After the fallen leaves, remove the fallen leaves and weeds in time, cut off the branches of diseases and insect pests, and move them to be buried or burned out of the garden.