Shelter smoke smoke prevention and stress
At present, even with cloudy days and hazy days, the low temperature, low illumination and high humidity in the shed provide favorable environmental conditions for the occurrence of diseases. The use of aerosols for pest control will not increase the humidity in the shed, but it will be more comprehensive and will not leave dead ends. It will also save time and labor, and the cost of medication will be low. Therefore, many farmers will choose to use aerosols to control the greenhouses. Vegetable pests and diseases. In order to achieve the best use of aerosols, it is recommended that vegetable growers pay attention to the following points.
First, prevent drug use in advance
The use of aerosols to prevent disease should be used early in the disease to control the disease. For example, like the common gray mold at the beginning of the disease, the spores of the bacteria are less. At this time, the spores of the bacteria can generally be controlled at a relatively low level, so as to avoid the serious occurrence of gray mold in the future. In the initial stage of insect pests, medications are used. At this time, the pests have poor resistance to the drugs and the amount of occurrence is small, which facilitates control.
Second, choose the right time to use drugs
Aerosols are best chosen for use in the evening or on cloudy days. This is because under sunlight, smoke is not easily deposited and affects efficacy. The aerosol agent uses the smoke as the carrier to achieve the purpose of medicine. Therefore, before using the smoke agent in the greenhouse, it is necessary to check the surface of the shed, make up the loopholes, and make the shed face close and tight. The effect of prevention and control is good. In addition, when vegetables grow weak, it is best not to use or reduce the use of aerosols to prevent phytotoxicity. Third, the details of safe medication can not be less
When placing aerosols, it is important to take care that the chemicals are not close to vegetables, and to avoid excessive exposure of the plants to chemicals when they are discharged, causing phytotoxicity. The humidity in the shed is relatively high when there is even a cloudy day, and the medicine is best placed on a dry floor to prevent the smoke from affecting the smoke. After all the smoke has been ignited, the vegetable farmer immediately leaves the shed and quickly closes the shed. Smoke smoke time can not be too long, the normal smoke time is generally 8 to 10 hours.
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