Take the following technical measures for the damaged greenhouse vegetables:
After the temperature of the restoration facility recovers, it is necessary to timely repair the damaged greenhouses due to rain, snow, and freezing to prevent further collapse of the greenhouses so as to prevent the disaster from further expanding.
Qinggou drainage should be drained around the greenhouse to reduce the water level, eliminate waterlogging, and prevent vegetable roots from rot.
In the light control temperature-control wet-storage greenhouse, a small arch shed is added. In the evening, multiple layers cover the cold insulation, and the covering is removed during the day to increase the light. After the rain (snow), the shade must be properly shaded to gradually increase the light and prevent the crop from being directly frozen. Exposure to sunlight to avoid dehydration and shrinkage of frozen tissue and loss of vitality; control watering to avoid lowering the temperature of the ground, increase air humidity, and cause disease; increase ventilation on sunny days, cloudy days should be appropriate at higher temperatures Exhale, control humidity and prevent disease.
Strengthen Management After the seedlings of frozen vegetables are intensified, management must be strengthened to promptly apply the available fertilizers and foliar spray 0.1% boric acid or 1% glucose to mitigate the cold hazards. Cut off dead branches and yellow leaves to prevent tissue from becoming moldy, lesions, and induce disease. Artificially spray warm water, add water, inhibit evaporation of water in the frozen tissue, promote tissue water absorption, and stabilize the temperature of the greenhouse. After the chilled plants are rejuvenated, the quick-acting fertilizers are chased and 0.2% potassium dihydrogen phosphate is added with 0.5% urea. The foliar spray is applied in combination with irrigation. The urea topdressing 15 kg per mu, diammonium phosphate 10 kg, and potassium phosphate compound 10 kg of fertilizer. Spray and prevent diseases, choose smoke or dust agent to prevent pests and diseases.
The major diseases that are easy to occur in greenhouse vegetables that are damaged by pests and diseases are gray mold and anthracnose, and the main pests that are prone to occur are aphids, whiteflies, and silkworms.
Botrytis cinerea is easy to occur in low temperature, high humidity and low light conditions, especially in greenhouses. Typical symptoms are cucumber, eggplant, tomato and other melons and fruits. The young fruits of the fruits are grayish white, soft rot, and grow a lot of gray green mold layer. It is mainly used for ecological control such as ventilation and dehumidification, chemical agents can be used 40% Tektronix suspension 800 times, or 50% Ariring dry 1000 times, or 50% acetaminophen 500 times spray control.
Anthracnose is prone to occur under conditions of high humidity, and peppers may occur from March to July. Typical lesions are round, light gray at the beginning, and later developed into dark brown, central grayish white round spots that easily cause the diseased leaves to shrink and fall off. After the onset of the disease is difficult to prevent. Prevent early use of 25% Amisida Suspension 1500 times, or 75% Dakenin WP 600 times, or 70% thiophanate-methyl WP 500 times.
Aphids and whiteflies should be strengthened in the early spring of March and April and in the fall of September. Conditions can be used plus insect nets, or yellow board seizures and other physical means. Chemical control can be selected from 10% imidacloprid wettable powder 1000 times, or 2.5% kungfu liquid 1000 times, or 25% Aktai water dispersible granules 2000-4000 times spray.
For underground insects such as silkworms, 2.5 deltamethrin EC or 20 fenvalerate EC may be used for 2000 to 3000 times; 50% phoxim EC may be used, or 90% of dichlorfon crystals may be used as 1000 times to control the ground during the appropriate period. spray.
Replanting and depleting vegetables that have been frozen to death should be settled, nursed, plucked, and site-smeared as soon as possible to prepare for squat production.
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