Phytotoxicity vaccine
The first reason is the misuse of pesticides or herbicides; the second is the concentration of pesticides is too high or continuous repeated application; the third is the application under high temperature conditions.
If the control measures are caused by the spraying of the chemical solution on the leaves and plants, if they are found in time, they can quickly spray the leaves with a large amount of clean water when the early chemical solution has not fully penetrated. Repeat the water spray 3 to 4 times to try The liquid washes away, and cooperates with the cultivating loose soil to promote root development and quickly restore normal plant growth. At the same time, according to the law of vegetable growth, the growth of vegetables is often inhibited after they are harmed by drugs. At this time, water should be watered in time and fully water-soluble fertilizers should be applied.
Wilt seedling
Most of the reasons are caused by the continuous opening of the shading net after the continuous rainy weather suddenly clears.
Preventive measures In case of continuous overcast and rainy days, the cover should not be lifted all at once, but should be removed in batches, gradually increasing the light, and avoiding the bottom wind. At the same time, spray water and control the temperature to increase the air humidity.
Root seedlings
The root damage caused by the high humidity and high temperature of the bed soil is characterized by yellowing and wilting of the leaves, and the seedlings stop growing.
Prevention and control measures Select a highly permeable soil as a seedbed. When raising seedlings in a protective field such as a greenhouse or a greenhouse, generally, the seedling bed should not be watered as much as possible or not when the seedbed is not drought. When the drought is relatively dry, the amount of water should not be too large. 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, the cover is opened to ventilate, and a thin layer of dry soil is evenly spread into the seedbed, and then the cover is tightly covered, which can reduce the bed soil humidity.
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