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Orchard frost poses a serious threat to fruit trees

The orchard frost threatens the fruit trees the most, the light ones reduce production, the heavy ones are out of production, and the disaster areas are difficult to determine, the disaster period has changed, it is difficult to control, and early prevention and disaster relief should be mitigated. Immediately take effective measures after the disaster and strive to minimize losses.

First, the type of frost.

1) Advance frost. The cold air mass below 0 °C flows in for 3~4d, the temperature drops to -5~-3°C or even lower, and the fully active flowers, leaves and tips are all seriously damaged. The general anti-frost measures are not effective. The above large freeze damage is of this type.

2) Radiation frost. This type of frost is prone to occur when the average daily temperature is low and the night is clear and windless. It is terminated before sunrise and lasts for 0.5~10h. It may also appear in several nights, usually down to -2~-1°C. Frost measures can be prevented.

3) Mix the frost. It began to invade by cold air masses, and then there was radiation cooling at night, and the temperature dropped sharply. Such frosts were difficult to prevent and fruit trees were seriously damaged.

Second, the factors affecting frost

1) Topography and topography. The higher the latitude and altitude of the orchard, the lower the temperature and the heavier the frost; the lower the terrain, the heavier the frost; the buffer around the river and the lake due to the water temperature, the frost is light or does not occur frost.

2) Variety. There is a certain difference in anti-frost ability between varieties, depending on the frost to light: Guoguang, Golden Crown, Fuji, Green Banana, Indian, Marshal. In the Marshal Department, Aspen's ability to resist frost is strong. Even if the center flower is frozen, it can still be harvested because of its strong ability to bear fruit.

3) Organs. The anti-frost ability of each organ of apple tree is quite different; in the same flower, the stamen is less resistant to low temperature than the pistil, and the stigma is frozen at -1.5 °C, and the seed is less resistant to freezing.

Critical temperature of each organ frost.

Flower bud period is -3.8~-2.8°C

Flowering period is -2.2~-1.6°C

Young fruit period is -2.2~-1.1°C

4) The height of the crown. The different heights of the canopy are completely different from the frozen condition. The closer to the ground, the heavier the frost, and the freezing damage is reduced with the increase of the crown. For example, in the spring of 2017, in the investigation of a peach garden in Fengrun County, Hebei Province, the freezing rate of flower buds below 1 m was more than 70%, and there was almost no freezing damage at 1.5 m. According to reports, the freezing rate of apple blossoms is 70%~80% of the main branches (below 1m), 30%~40% of the main branches of the second layer, and only 10%~20% of the main branches of the third layer. Therefore, in the fruit area where the frost occurs frequently, it is possible to reduce the degree of frost by appropriately increasing the height of the result portion.

5) Azimuth. The crown has different degrees of frost in different directions. According to reports, the average rate of flowers on the windward (north) surface of the new red and green banana crowns is 56.2%, and the leeward (south) surface is only 20.9%.

We produce against frost candles for fruit farmers all year round. Our customers will book anti-freeze candles in October of each year and receive them in March-April. If you need to use against frost candles urgently, we also have stocks for sale. Please feel free to order our anti-freeze candles. As a professional against spring frost candles manufacturer, we will provide the best service and will not delay for your use.

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TaBo Candles Factory
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