In the spring, the key to the management of fruit trees is to strengthen management, prevent the occurrence of frost damage in fruit trees, and ensure that fruit trees will survive the spring.

Frozen injury site

Tender cold injury: Due to the late growth of fruit trees, the development of immature twigs, the organization is not full, underdeveloped protective tissues, susceptible to frost damage and dry death.

Branches freeze damage: Normally developed shoots, which can also occur 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 sprouted late, the leaves were thin or deformed, and the growth was abnormal.

Branches freeze-dried: The cortex of the frozen branches subsides or cracks, and the inside is darkened by browning and the tissues are dead. In severe cases, the large branches also died one after another.

Cold damage to roots: Roots and stems refer to the stem base of fruits, and the relative cold resistance of the roots and stems of fruit trees is poor. After freezing, the rhizomes of the roots and stems turn dark and die, and the roots occur at the top, while the heavy ones form a black ring and surround the stem, and the whole plant dies.

Root damage: In the roots growing underground, freezing damage is not easily detected, but it seriously affects the growth of the above ground. The phenomenon of budding late or irregular in the spring, or dry shrinkage after putting the leaves. The outer cortex of the frozen root system turned brown, and the cortex separated from the xylem and even fell off.

Precaution

The roots of the fruit trees are covered with soil: they are planted along the trunk around the tree plate, and the height of the soil is 20-25 cm. After the early spring temperature rises, the soil will open and the frozen roots of fruit trees will be reduced. But do not take the soil on the tree tray to prevent the root system from being exposed to freezing.

The trunk is painted white: The white trunk of the fruit tree and the main branch are whitened in a timely manner with the whitening agent, so that the temperature of the tree body changes stably, there will be no freeze-thaw, no frost, no frost, and no bacteria in the trunk. , eggs and adults. The proportion of whitening liquid is: 100 parts of lime, 10 parts of sulfur powder, 10 parts of salt, 1 part of vegetable oil, and 200 parts of clear water.

Tree bandaging: According to the weather, use straw rope to wind the trunk, main branch, or bind the trunk with straw.

Smoke and Frost Protection: In the early afternoon of heavy snowfall, it should be in the park, with 6 piles of smoke per acre orchard, and the fumes should be stopped after the sun comes out on the 2nd day. For 2-3 consecutive nights, there is a good fight against cold. Anti-frost effect.

Timely clearing snow from the trees: Because the fruit trees have not fallen leaves, the snow covers the branches and leaves of the canopy, increasing the weight of the branches and leaves, causing the branches to bend and break.

Strengthen the cultivation and management work in the coming year: timely fertilization, watering, and restoration of tree vigor; at the same time, the trees are susceptible to pests and diseases after being chilled and should be promptly controlled.

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