Causes and Prevention of Tomato Root Rot Disease

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First, the cause of tomato rot in the greenhouse

1. Humidity in soil Due to the low temperature and humidity in the winter greenhouses, the transpiration of the plant leaves is small, the ground temperature is too low due to a lot of watering, and the soil permeability is poor, causing the phenomenon of rot and roots.

2. The suitable temperature for low root temperature night growth is 20-30°C, and the physiological function is lower than 13°C. Long-term growth of plants at 13°C was poor, and growth was stopped at 6-8°C. The night temperature in the greenhouse should be kept above 15°C to ensure that the ground temperature is above 20°C.

3. The optimum temperature for large tomatoes during the day-night temperature difference is 25-28°C during the day and 16-20°C during the night. When the long-term nighttime temperature is lower than 15°C, and the daily temperature is higher than 30°C, the roots in the underground are damaged and the above-ground transpiration is too large, causing the plants to wilt.

4. Long-term re-dipping time will cause a large amount of various pathogens to remain in the soil. The activity of pathogenic bacteria makes tomato susceptible to bacterial wilt, blight, and other diseases. And it is easy to affect the granule structure of the soil and damage the soil permeability.

Second, control methods

1. The varieties cultivated with disease-resistant varieties in winter greenhouses should be of the indefinite growth type, large fruit, cold-tolerant, shade-tolerant and disease-resistant varieties.

2. The soil that is easily rooted in organic fertilizers is often clayey loam with poor viscous and air permeability. Organic fertilizer is not only comprehensive and rich in nutrition, but also can effectively improve the soil aggregate structure, increase soil permeability, and prevent the occurrence of diseases.

3. There are many kinds of pathogenic bacteria in the soil before the planting of the high-temperature shed, especially the heavy rake. The high-temperature shed can be sterilized and prevented. The method is: in the 7 to 10 days before the planting, the soil in the shed shall be turned 20 cm deep to spray the bacteria. Ling fungicide, cover the film so that the temperature within the shed reaches 50 ~ 60 °C, shed 5 ~ 7 days, heavy smashed sickness can be repeated 2 or 3 times.

4. Control the number and time of watering Since the temperature is low and the soil moisture evaporates less, watering should be properly controlled. Generally, water should be poured every 7 days. The time for watering should be controlled by the "cold stream tail, warm flow head", and it must not be watered when cold or even cloudy.

5, increase the night temperature affecting the winter greenhouse vegetable production constraints are mainly night temperature, to increase the night temperature method is mainly a thick grasshopper, the thickness of the shed in the shed after the day does not see light prevail. 2 Double film covering, that is, covering the grass grasshopper at night with a layer of film, which can not only keep warm but also protect the grasshopper from rain and snow.

6, to strengthen the ventilation of the shed within the light of the winter shed, especially after watering (under the premise of ensuring the temperature of the shed) should increase the amount of ventilation and light, reduce air and soil moisture inside the shed to prevent the occurrence of diseases.

7. If any vegetable is grown in the same plot for a long time, it will cause a large number of pathogens to multiply. The change of soil is an effective measure to prevent the occurrence of double crop disease.

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