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. Should pay attention to the following four points:

Pay attention to choose the appropriate dust agent: control cucumber downy mildew, tomato late blight, use 10% antifungal agent or 5% chlorothalonil dust agent; control cucumber anthracnose, black heart disease, use 5% chlorothalonil or 12% of Kekeling Dust Agent; Control of cucumber bacterial keratopathies, use 10% of B Dust; Prevention of Botrytis Cinerea, Leaf Blight, Early Blight and Late Blight, Choose 12% of Benefits of Dust .

Pay attention to choose the right duster: It should adopt the domestically-produced type 5 or 10 hand-type 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.

Pay attention to the time of spraying: Apply it in the morning or in the evening on sunny days, and spray it on cloudy and rainy days. 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.

Pay attention to the spraying method: spraying the vegetables, whether uniform or not, the effect is very poor. 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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