The use of aerosols to prevent pests, labor-saving, labor-saving, provincial medicine, but improper application is likely to cause the occurrence of injury, resulting in the emergence of vegetables, leaves whitening, dry edge phenomenon, and even drop flowers. Therefore, to remind farmers, we must master the usage and dosage of aerosols and guard against the occurrence of injury.
Strictly control the dosage
The aerosol agent controls the pests and diseases caused by the rise of smoke emitted after the active ingredient is ignited. Therefore, before the medicine is applied, the volume of the greenhouse is accurately calculated according to the length, width, and height of the greenhouse, and then the smoke is calculated according to the size and incidence of the vegetables. The amount of the agent must not be used to increase the dosage of the drug in order to enhance the control effect. Under normal circumstances, commonly used 45% of chlorothalonil smoke agent, 10% fast-kerosenic, 15% carbendazim smoke agent, each dose of 0.3 ~ 0.4 g / m3, 300 ~ per acre dosage 400 grams.
Strict control of smoke length
Different aerosols have different fumigation times, usually 4 to 10 hours. The same aerosol agent was applied to different types of vegetables and the fumigation time was not exactly the same. When farmers purchase aerosols, they must be aware of the fumigation time of the aerosols on vegetable cultivation. It is advisable that the bactericide should not exceed 8 hours. Compared with bactericidal aerosols, insecticide aerosols have a large amount of smoke and a high concentration. Attention should be paid to shortening the fumigation time, generally 4 to 5 hours.
Pay attention to medication time
Aerosols are best used in the evening or on cloudy days due to the fact that smoke is less likely to deposit during exposure to sunlight and affects efficacy. Flue-curing tobacco should be applied after watering on the same day. Avoid application when the soil is dry. In a greenhouse that has just been poured into water, the humidity in the greenhouse is high. At this time, the effect of aerosol application is good, and it is not prone to phytotoxicity. On the other hand, smoking in a droughty greenhouse is extremely prone to phytotoxicity. When it is windy, it is best not to use aerosols; when the plants grow weak, they can also be used without or with reduced application, especially to the late growth stage of vegetables. Because the plants grow weaker, their resistance to drugs is greatly reduced. At this time, aerosols are used. It is prone to injury.
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