Watermelon root disease symptoms and prevention methods
Watermelon root disease easily occurred in the seedling stage. The seedlings grew slowly, and the leaves shrank and wilted. The roots initially became yellowish and rusted, and no new roots were found. The roots became wilting and died. The disease is mainly caused by excessive soil moisture and low soil temperature. Under conditions of low temperature and high humidity in the soil, the development of roots is hindered, and the regenerative ability, absorption function, and respiration of the roots are severely suppressed, and a large number of root hairs are dying, causing the ground parts to wilt. When growing nursery, try to use nursery bowls or nursery to raise seedlings. The main humidity is not large.
Control methods
(1) For low-temperature type root:
The first is to strengthen the management of bed soil. Use compost or decomposed organic fertilizer made from fermented bacteria. The surface must be flat and the bottom water must be poured before sowing. Conditional use of greenhouse sheds or sheds covered with plastic film, geothermal greenhouses, electric hotline nursery methods such as the middle temperature seedlings.
The second is to strengthen the temperature and humidity management. The soil temperature at seedling stage is controlled at 15-25°C, the daytime temperature is controlled at 22-28°C in cotyledon stage and two true leaf stage, the night temperature is 18-13°C, and the soil moisture content is controlled at 60-80% of the maximum soil water holding capacity. . Correctly grasp the timing of ventilation and the amount of ventilation, so that seedlings thrive, after the occurrence of a slight rooting, it is necessary to loose soil in time, increase the temperature, seedling water shortage is prohibited. (2) For high-temperature type root:
One is to choose land plots or colonies with high topography and well-drained land. After the rain, the water shall be drained in time, shading shall be used to shade it properly, and conditions shall be used to prevent rain. In the case of raising or cultivating with a geothermal greenhouse or heating wire, pay attention to lowering the ground temperature and distributing water.
The second is to improve the method of raising seedlings. In early spring or summer nursery, it is best to use nutritious earthwork or plastic pots, nursery boxes, etc., can effectively prevent the occurrence of root disease.
The third is to spray 80% Dufu zinc (Greenhenge No. 2) WP 800 times or plant power 2003 nutrient solution, 1kg every milliliter of water once every 7 days, once every two times.
Fourth, timely cultivating loose soil in order to facilitate the control of ground temperature.
Fifth, when using organic fertilizer such as chicken manure, it is necessary to pour the fertilizer one year ahead of time to fully decompose it. Never use fresh chicken manure and human excrement to avoid burning roots.
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