The dusting method is used to prevent vegetable diseases in greenhouses. It has the advantages of saving labor and medicine, not increasing the humidity in the greenhouse, and preventing and controlling the effects. The following four points should be taken into account during specific operations:
First, pay attention to choose the appropriate dust agent
For the control of cucumber downy mildew and tomato late blight, use 10% antifungal agent or 5% chlorothalonil dust agent; control cucumber anthracnose, black heart disease, use 5% chlorothalonil or 12% carbon charred dust Agents; control cucumber bacterial angular spot, use 10% of the B dust agent; prevention and treatment of vegetable gray mold, leaf mold, early blight and late blight, use 12% of the benefits of dust agent.
Second, pay attention to choose the right duster
Should adopt domestic harvest type 5 or 10 hand powder duster. Before the spraying, the shed was closed, and then 1 kg of powder was sprayed for each acre. The pesticide was put into a duster kit and the amount of powder discharged was adjusted to about 200 grams per minute.
Third, pay attention to spraying time
Sunny days should be applied in the morning or early evening. Cloudy and rainy days can be sprayed all day. The effect of applying pesticides is best after closing the shed in the evening. In the sunny morning to the afternoon when the sunlight is strong, the dustproof effect is low.
Fourth, pay attention to spraying methods
Spraying on vegetables, whether homogeneous or not, has poor results. Only uniform air spray effect is good. If the air spray is not uniform, part of the powder cannot be well dispersed and the control effect will be reduced.
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