To control pests and diseases in greenhouse vegetables, people usually use spray and smoke methods. However, in the case of cloudy snow weather, the temperature in the shed is low and the ventilation is reduced. If the spray is used to prevent and control diseases, the humidity of the greenhouse will be significantly increased, and a vicious cycle of “large humidity, increased disease, multiple application of pesticides, and high humidity†will be easily formed. With the smoke method, vegetable farmers need to be ventilated in time to avoid phytotoxicity. In recent days, there have been many examples of gas damage caused by poor weather conditions that could not be lifted for two or three consecutive days. At the same time, the type of smoke agent is relatively single, which is not conducive to the comprehensive prevention and control of mixed diseases.
Then, in the cloudy snow days, which kind of pesticide application method can better control the diseases in the greenhouse? Powder spraying method is a good solution to this problem. The use of powder spraying method not only saves labor and labor, reduces labor intensity, but also does not increase the humidity in the greenhouse. It is worth advocating. Use the following two points when using:
One must choose the right dust agent. Spraying powder should use special dust agent. Commonly used wettable powders are generally not used for dusting, otherwise it is easy to burn the leaves. The commonly used dust agents are: control cucumber downy mildew, gray mold, tomato late blight, use 5% chlorothalonil dust agent; control cucumber anthrax, use 5% chlorothalonil or 12% charcoal dust agent; control cucumber Bacterial angular spot, use 10% B drops of dust.
Second, pay attention to spraying methods. Spraying should be evenly sprayed on the air instead of spray on the plants, so that the pesticides can be scattered on the leaves of the plants in order to achieve good results; if spraying directly on the vegetables, it is prone to uneven use, and some powders cannot be used. Disperses well on the leaves, making it less effective.
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