Phytotoxic seedlings. One is the misuse of incorrect pesticides or herbicides; the second is the application of pesticides at too high a concentration or the repeated application of pesticides; the third is the application of pesticides under high temperature conditions. Prevention and control measures: If the leaves and plants are caused by spraying liquid medicine, if it is found in time, when the liquid medicine has not penetrated completely in the early stage, spray the leaves with a large amount of water quickly, and spray water repeatedly 3 to 4 times, try to remove the damage on the surface of the plant. The medicinal solution is washed away, and cooperates with cultivating to loosen the soil to promote root development and quickly restore normal plant growth. At the same time, according to the growth law of vegetables, when vegetables suffer from phytotoxicity, their growth is often inhibited. At this time, it is necessary to water in time and apply fully water-soluble fertilizer.

Wilting seedlings. It is mostly caused by uncovering all the sunshade nets after continuous rainy weather suddenly turned clear. Prevention and treatment measures: After a continuous cloudy and rainy day suddenly turns fine, do not remove all the coverings immediately. They should be removed in batches. The light should be gradually increased and the bottom wind should not be allowed to pass. At the same time, spray water, control temperature, and increase air humidity.

Retting root seedlings. Root damage caused by high humidity and high temperature in the bed soil is characterized by yellow and wilting leaves, and seedlings stop growing. Control measures: Choose soil with strong air permeability as seedbeds. When seedlings are raised in protected areas such as greenhouses or greenhouses, generally the seedbeds should be watered as little or not as much as possible when the seedbeds are not obviously dry, and the amount of watering should not be too large when it is dry. If the humidity in the bed is too high, it can be covered with dry grass and wood ash, and it can also be properly ventilated and dehumidified. After the cotyledons are unfolded, remove the cover for ventilation.

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