Cucumber seedling rooting is a physiological disease, mostly caused by improper management. At the time of initial infection, rust appeared in the roots. In severe cases, the roots were rotted, and no new roots were found. The seedlings turned yellow and wilted, and all of them died later.
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 farmhouse fertilizer. In order to raise vegetable seedlings, it is necessary to add farmyard manures, especially hot manures, 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. Maintain the proper temperature. Bed soil preparation should be reasonable, after sowing to the seedling period should ensure that the appropriate soil 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. Reduce humidity in time. When raising seedlings in shelters such as greenhouses or greenhouses, generally the seedbeds are not significantly watered when the seedbeds are in contact with each other, and watering or watering should be avoided as much as possible. The amount of watering during obvious droughts should not be excessive. 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 lighting. Before growing seedlings, choose a place with adequate light to build seedbeds. 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, choose clear and warm weather to open the cover for 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 a certain warming effect. .
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