1, the main cause of the disease is low temperature and humidity, lack of light, sowing too dense, too much nitrogen fertilizer and bed soil bacteria.
Tomato seedling stage damping-off disease is mainly divided into emergence period, rotten species, post-emergence tripping. The post-emergence infestation is mainly in the early stage of seedling growth. It mainly damages the roots of seedling stems on the roots and soil surface, showing water stains turning brown, the base of the stems shrinking linearly, the seedlings lodging, the incidence rate is very fast, and the seedlings die. . Prevention and control can be used to spray a water agent, fine metalaxyl manganese zinc, Prelik to control.
2. The rooting of tomato occurs mainly in the seedling stage. If the ground temperature is less than 12 degrees for a long time, the light is weak and the watering is too large. Plants do not produce new roots, and the root epidermis becomes rust-brown, and the root epidermis is easily stripped. In severe cases, rot occurs, resulting in wilting or dead trees. The leaves on the ground are yellow, and the leaves are in the dark, and the growth is extremely slow. Prevention and control methods, watering at the seedling stage should be controlled, spray rooting agent timely, and promote root development; spray chitin, alizarin and other conditioners on leaves to increase plant resistance.
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