Beware of problem seedlings in summer

Phytotoxic seedlings

The first reason 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.

If the prevention and control measures are that the leaves and plants are damaged by spraying the 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 the water repeatedly 3 to 4 times, try to remove the medicine on the surface of the plant. The liquid is washed away and combined with the field loosening 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, they should be watered in time and topdressed with water-soluble fertilizers.

Wilting seedlings

The cause is mostly caused by uncovering all the sunshade nets after continuous rainy weather suddenly turned clear.

Preventive 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

The cause is the root damage caused by the high humidity and high temperature of the bed soil. The manifestation is that the leaves are wilted and the 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, uncover the cover for ventilation, and evenly spread a layer of fine dry soil into the seedbed, and then cover the cover tightly to reduce the humidity of the bed soil.

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