Due to the high temperature and humidity in the vegetable greenhouse, the light is weak, the air flow is slow, and it is almost free from the external wind and rain. The vegetables grow vigorously and the buds are tender, and the vegetables are susceptible to pests and diseases. For example: continuous low temperature, high temperature, easy to bring disease at the seedling stage, excessive application of foliar fertilizer and plant growth regulator such as silk flower, easy to start eggplant, tomato gray mold. The following Qianhui greenhouse manufacturers introduce the preventive measures for pests and diseases in greenhouse greenhouses:
Watering
Before planting, after planting, it is necessary to pour the bottom water, and then slow down the seedlings and pour the water to the seedlings. Minimize watering during the growing period to prevent over-frequency watering during the growing season to reduce ground temperature and increase air humidity. If you need watering during the growing period, you can ditch the small water and avoid flooding.
2. Covering no drip film
Due to the large difference in temperature between the inside and outside of the greenhouse, the condensation of the film is inevitable. The surface of the ordinary plastic film has a uniform distribution of dew condensation, so that the dripping surface is large, and the air humidity is severely increased. After using no drip film, although the surface is also dew, the water droplets flow down the film surface, and the dripping surface is small, which increases the humidity of the air.
3. Ridge covering film
Ridge covering the mulch can maintain soil moisture, reduce evaporation and reduce air humidity. Under-film irrigation can also reduce air humidity during irrigation.
4. Reasonable close planting, using large and small rows of cultivation
The planting density in the vegetable greenhouse should not be too large. Under the possible conditions, it should be cultivated in large and small sizes to facilitate ventilation and ventilation and reduce air humidity.
5. cultivating loose soil
Temporary tillage of loose soil after watering can reduce evaporation, maintain soil moisture, reduce the number of watering, and reduce air humidity.
6. Ventilation
Under the premise of ensuring proper temperature, timely ventilation and discharge of moisture can effectively reduce the relative humidity of the air in the shed.
7. Watering time
Watering in the cold season should be carried out on a sunny morning. Immediately after watering, close the shed and raise the temperature. Wait until noon and afternoon to increase ventilation and discharge moisture.
8. Reduce the route of transmission of diseases
The pathogens of vegetable diseases are transmitted from wintering, summering or diseased plants to other plants, and there are one or several routes of transmission. Blocking these pathways in management can reduce the prevalence of the disease. Taking celery as an example: diseases such as sclerotinia, early blight, and spot blotch are all spread by water droplets. In the cultivation, the prevention of water droplets can reduce the epidemic of diseases; soft rot and virus diseases mainly rely on farming operations and contact propagation. In the field management, try to avoid the cross-contact of disease and healthy plants, and reduce the disease pandemic; viral diseases mainly rely on aphid infection, timely prevention and control of aphids can reduce infection.
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