With the advent of the late winter season, the temperature gradually drops, and the tomatoes grown in the winter shed are facing the test of low temperature. Tomato is a thermophilic crop, and its tolerance in cold environments is limited. When cultivating tomatoes or seedlings in winter and spring or late winter, they will suffer low-temperature cold damage when encountering low temperature or frost. In late winter, when the temperature of the shed is at 5℃～10℃ for a long time, the leaves will appear dark green or flooded. When the temperature continues to hover at 5°C, the leaf edges will become chlorosis. Living in a low temperature environment below 5°C for a long time, plants will become chlorosis and albino due to chilling damage, and the plants will die due to chilling damage. This symptom is very easily confused with the symptoms of magnesium deficiency in tomatoes. However, analyzing the seasonal climate, in the deep winter when the temperature is low, if leaf chlorosis occurs, the first consideration should be low temperature damage. Tomatoes survive for a long time in a low temperature environment below 5°C, the plants will be chlorosis and albino due to chilling damage. In severe cases, the plant will die due to chilling damage. Starting from the seasonal climate, checking its management level and insulation measures, you can distinguish the difference between freezing damage and nutrient deficiency. Pay attention to timely and symptomatic treatment to minimize unnecessary losses.

Remedy for freezing damage: In addition to choosing cold-tolerant and low-temperature resistant, low-light varieties, the management of greenhouse tomatoes starts with heat preservation, and improving the heat preservation measures of the greenhouse is the main measure to treat frost damage. Measures such as thickening the thickness of the soil wall, increasing the density of grass felt, and buckling the arch in the greenhouse can be used to increase the temperature and resist the cold. In case of sudden frost and cold, spray a new high-fat film for heat preservation and antifreeze to improve crop resistance to cold. Cooperate with temporary heating measures, coal-burning stoves or laying hotlines.

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