In recent years, due to serious diseases in the cultivation of greenhouse vegetables, many vegetable farmers in order to prevent diseases as soon as possible, regardless of disease and disease-free, every 7 to 10 days to fight a drug. They believe that if a disease occurs, the vegetables are harmed, affecting yield, and the diseased leaves and plants cannot be recovered. It is better to fight drugs earlier, so that the vegetables do not develop well. And it is much easier to fight against drugs than to treat them afterwards. This view has been accepted by many vegetable farmers. Therefore, there are many pesticides used in greenhouse vegetable cultivation. This practice is correct from the perspective of disease prevention and control. However, the purpose of the production of vegetables is definitely not to prevent diseases in vegetables, but to produce high yields, to provide for human consumption, and to ensure the health of people. If you consider from this perspective, this approach is debatable and the effect is not good.
In fact, in addition to spraying pesticides, there are many agricultural measures to prevent vegetable pests and diseases. If you pay attention to ventilation and reduce the humidity in the greenhouse, you can prevent diseases such as downy mildew, disease, and gray mold; deepen the soil, promote root development, and reduce the risk of soil-borne diseases such as blight, root rot, etc.; Organic fertilizer can improve the disease resistance of vegetables. Chemical control is the last resort to take when other preventive measures do not work. In other words, when preventing vegetable pests and diseases, spraying should be the last link, not the preferred and only option.
In fact, in addition to spraying pesticides, there are many agricultural measures to prevent vegetable pests and diseases. If you pay attention to ventilation and reduce the humidity in the greenhouse, you can prevent diseases such as downy mildew, disease, and gray mold; deepen the soil, promote root development, and reduce the risk of soil-borne diseases such as blight, root rot, etc.; Organic fertilizer can improve the disease resistance of vegetables. Chemical control is the last resort to take when other preventive measures do not work. In other words, when preventing vegetable pests and diseases, spraying should be the last link, not the preferred and only option.
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