Prevention and Control of Botrytis cinerea at Vegetable Seedling Stage

Botrytis cinerea was pale in color, and the leaves and petioles appeared greyish white, water stained, and the tissues were softened to rot. When the humidity was high, there were gray molds on the surface. The young stems are mostly spotted in the irregular water at the base of the petiole, quickly become soft and rot, shrink or fold, and finally the diseased seedlings rot and die.

Botrytis cinerea mainly winters in soil. The germs are resistant to low temperatures and spores are produced in large quantities at 7°C to 20°C. They are transmitted by air flow, watering, and agricultural operations. Seedling greenhouse temperature 15 °C -23 °C, low light, relative humidity more than 90% or the surface of the seedlings with water film is most susceptible to disease. In case of rainy or cold windy weather, the air is not timely, the density is too large, the seedlings are too long, and when the seedlings are transplanted, the roots and leaves will be aggravated.

During the prevention and treatment, we must strengthen seedbed management, do a good job of ventilating and evacuating greenhouses, so that the relative humidity of the air does not exceed 65%; do not apply nitrogenous fertilizers, increase phosphorus and potash fertilizers, and cultivate strong seedlings to enhance the disease resistance of the plants themselves. Proper irrigation, rainy days or afternoon should not be watered to prevent freezing damage; remove the diseased seedlings and find out that diseased seedlings of gray mold must be removed in time, put them in plastic bags and take them out of the shed, and timely spray protection; in order to reduce the shed Humidity, try to use the smoke agent fumigation. Can choose to use SingDai brand bactericidal smoke agent or a smoke swift keling smoke agent, 250 grams per mu, in the evening closed shed fumigation. When it is fine, it can be used from 6am to 2pm with 65% of Cadreum or Shenghua No. 1 or Baikeke or Sikroking, etc. The above fungicides can be mixed with foliar green leaf treasure or green sea or Dri Or with the use of high beauty and equipment, it can also be used with Yunda 120 or Tianfengsu or 481 to increase the disease resistance of seedlings.

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