I. Symptoms Identification No new roots or adventitious roots were found in the common roots at the nursery stage. The root rind rotted and the internal tissues darkened and the water was brownish. The aboveground part is wilting, easy to pull up, and the leaf margin is dry and coke. When it is serious, it becomes dry.
Second, the onset conditions of the ground temperature is lower than 12 °C, and long duration, excessive watering or even rainy days, due to poor soil ventilation.
Third, control methods
1. Apply sufficient farmhouse fertilizer for vegetable seedlings, and increase the use of farmyard manure, especially hot manure, to cultivate fertility, cultivate strong seedlings, improve disease resistance of vegetable seedlings, and increase ground temperature to reduce disease occurrence. Specific approach: before the vegetable nursery, fully cooked hot farmyard mash and bed soil mix. However, it must use decomposed hot farmyard fertilizers, otherwise it will cause burning roots.
2, to maintain a reasonable temperature bed soil preparation should be reasonable, after sowing to the seedling period should ensure that the appropriate temperature. In case of rainy days and insufficient light, warming and heat preservation measures should be taken. Winter and early spring nursery seedlings in the shed best use electric hot nursery to facilitate insulation.
3, timely reduce the humidity in greenhouses or greenhouses and other places to protect seedlings, the general seedbed is not obvious drought (the topsoil does not scattered group) when not watering, should be as little as possible water or not watering; significantly drought when the amount of watering Should not be too large. Don't be wet in the seedbed. If the seedbed is too dry, it can cover moist fine soil. This will not only ease the water requirement of seedlings, but also reduce the air humidity in the seedbed. If the humidity in the bed is too large, it can cover the ash, or it can be properly ventilated and ventilated at high temperatures at noon.
4, pay attention to increase the light before nursery, to choose a place with adequate light to build a seedbed. This is conducive to the seedlings robust growth and development, enhance their resistance to disease, reduce the emergence or spread of roots in vegetable seedlings.
5, timely ventilation After the cotyledon is unfolded, select clear and warm weather to open the cover ventilation, and evenly spread a layer of fine dry soil to the seedbed, then cover the cover tightly. This will not only reduce the humidity of the bed soil, but also have certain Warming effect.
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