How to deal with serious freeze injury of strawberries?

The frost injury of strawberry generally occurs when the temperature drops suddenly during autumn, winter and early spring, some leaves are dried up by freezing, sometimes the stamens and stigmas rise and shrink after freezing, the stamens turn black, brown and die, and the fruit is stiff. So what about the serious freezing injury of strawberries? Come and have a look with the editor.

1. Symptoms of frost injury

In the freezing injury of the seedlings, the two leaves first lost green, and then slowly showed a white edge. after the planting survived, the real leaves were dark green at first, and then gradually lost water. When the growth tip of the seedling is frozen, the growth point will blacken and gradually dry up to death. when the root system is frozen, the lateral root and root hair will turn oil white and yellow to brown, and the absorption function of fertilizer and water will be weakened. Some leaves regret drying up after freezing, after the stamens and stigmas are frozen, the stigma rises and shrinks upward, the stamens turn black and brown and die, and the young fruit stops developing, withering and stiff.

2. Preventive measures

First of all, suitable varieties should be selected and planted at the right time, do not remove the mulch prematurely in early spring, and cover with film or smoke to prevent frost before the cold spell in the early flowering stage. In late autumn, dwarf can be used to inhibit overgrowth, irrigate frozen water before winter, improve cold resistance, and cover cold protection when overwintering. At the same time, timely repair of the damaged greenhouse film, conditions can release fumigant, reduce air humidity, prevent frost injury, increase the application of antifreeze and foliar fertilizer, improve the cold resistance of the plant. Remove frozen inflorescences and fruits and other organs in time and deal with them centrally to avoid greater damage caused by decay.

3. Mitigation methods

After the occurrence of freezing injury, it can be irrigated and insulated, prevent the ground temperature from falling, stabilize the surface atmosphere, help the air temperature rise steadily, and restore the function of the frost-damaged tissue. In addition, artificial water spraying can also increase the humidity in the greenhouse, stabilize the temperature, inhibit the evaporation of water from the frozen tissue, and promote the tissue to absorb water. After slow seedling of frozen tissue, chemical topdressing organic fertilizer, less nitrogen fertilizer, can also spray foliar fertilizer to form a protective film in the leaves to control transpiration. In order to avoid mildew in the frozen parts and cause diseases again, the frozen flowers, fruits and chemicals should be removed in time, and the nutrient consumption of plants should be reduced at the same time. A sunshade can also be built in the shed to prevent the frozen strawberries from receiving direct sunlight, resulting in tissue dehydration and shrinkage.

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