In the process of tomato planting, more or less will be accompanied by various types of diseases. Therefore, it is necessary for the farmers to take preventive measures in the tomato seedling stage. The main control diseases include rickets and blight. These two diseases and prevention management are emphasized.

Main diseases of tomato seedling

First, the disease

1. Causes of the disease: Due to the low temperature and high humidity of the seedbed for a long time, the addition of rainwater, unreasonable watering, insufficient illumination time, and poor ventilation and ventilation conditions all lead to the occurrence of the disease.

2, the time of onset: Mostly in the early stage of the seedling bed, the leaves of the seedlings are exhausted, the new roots are still not the most susceptible to the disease.

3, the symptoms of the disease: the seedlings will appear water-stained lesions at the base, then the color becomes brown and slowly shrink, knowing that the volts fall, if the humidity is relatively large, it will produce white flocculent hyphae.

Second, the blight

1. Time of illness: Seedlings and seedlings that have just been unearthed may be affected. The base of the stem of the diseased seed becomes brown, and then slowly shrinks until the stems and leaves are dying. And planting 5-10 days or a relatively large diseased seedlings, dark brown oval lesions appear at the base of the stem of the diseased seedlings, although it will be wilting during the day, but it will be restored to its original state.

2, the characteristics of the disease: the lesion gradually sag, after a week, the base of the stem shrinks and thins, the stems and leaves of the aboveground parts are wilting and dry. After colonization, due to the relatively high humidity, it is easy to rot, resulting in a pale brown spider silky mold layer, and later formed sclerotia.

Third, the difference between squatting disease and blight

1. Symptoms: Blight disease is standing and dying. Oval irregular dark brown lesions appear in the early stage of the disease, and then slowly expand until the leaves are wilting and dead; the disease is the seedlings falling and dying.

2. Symptoms: The pathogen of the blight is a mild-brown spider-like mold; the disease is a white floc.

2, the onset temperature: about 15 degrees is easy to cause rickets; about 20 degrees is likely to cause blight.

3, onset time: the occurrence of blight is late, occurs after emergence of seedlings; the disease occurs in the early stage of seedlings, and the seedlings that have just been unearthed have more onset.

Tomato seedling management points

First, adapt to local conditions

For the planting area and planting variety, it is necessary to select the suitable main disease-resistant variety according to the local weather or the environment required for tomato growth.

Second, strengthen seedbed management

1. Selected seedbeds

The basic requirements of the seedbed are: flat terrain, good drainage performance, ventilation and ventilation, and sufficient sunshine.

2, seedbed

If conditions permit, you can choose a new bed. If you use a seedbed, you should do disinfection measures, especially soil disinfection, to reduce the bacteria in the soil.

3. Control field temperature and humidity

a. Ensure ventilation and ventilation of the seedbed and reduce the humidity of the seedbed. If conditions permit, hot wire heating can be used to heat the bed soil.

b. Spreading grass ash in the field can not only adjust the acidity and alkalinity of the soil, but also reduce the soil moisture. During this period, reasonable watering is also carried out.

4, keep the garden health

Keep the pastoral clean and remove the weeds and susceptible seedlings in time.

5, cultivation measures to prevent disease

You can use nutrient mash or plug seedlings. When planting, the plants should not be too dense, otherwise it will easily lead to the spread of pathogens; rational fertilization, not excessive nitrogen fertilizer, balanced fertilizer nutrients; in the application of farmyard manure, it should be fully decomposed .

Third, seed treatment, use disease-free seeds

1. Before sowing, first soak the seeds in 55 degrees warm water for 15 minutes, which can play a role in controlling germs.

2. Seed dressing with seeds, and select agents that can prevent fungal and oomycete diseases, such as carbendazim, carbendazim, metalaxyl, and mancozeb.

Fourth, pharmaceutical treatment

The choice of pharmaceuticals is mainly Shantui, Mancozeb, and Green Health.

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