Which parts of fruit trees are vulnerable to freezing

Recently, the reporter interviewed Han Mingyu, a professor at the College of Horticulture, Northwest Agriculture and Forestry University, about which parts of the fruit trees were susceptible to freezing damage.

Twig freezing injury due to the late stop of growth of fruit trees, immature twigs due to its unreliable organization, underdeveloped protective tissues, and susceptible to frost damage and dry death.

Branches that freeze and damage normally developed shoots can also be frozen when the temperature is too low. The appearance of some shoots did not change significantly, but the color of the xylem was dissected and then the black heart was formed. The frozen shoots were late and the leaves were thin or deformed and grew abnormally.

Branch frost damage was caused by the subsidence or cracking of the dry cortex of the frozen branches, and the inside was dark browned and the tissues died. In severe cases, large branches also died one after another.

Roots and necks freeze the roots of the fingernails. The roots and necks of the fruit trees are relatively poor in cold resistance, and the roots and cortices become dark and dead after freezing, and lightly occur in the local areas, while the heavy ones form a black ring and surround the dry period, and the whole plant dies.

Roots freeze damage to the underground growth of the roots, freezing damage is not easy to find, but seriously affect the growth of the aboveground. The outer cortex of the frozen root system turned brown, and the cortex separated from the xylem and even fell off.

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