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The matters needing attention in spraying pesticides in different facilities
The dusting method is used to prevent vegetable diseases in the facility and does not increase the humidity in the greenhouse. Because the dust flows for a long time, the granules can be deposited in various parts of the plant, and they can spread to the hidden areas of the plants. Even if the protected area is not closed tightly, it will not affect the control. effect. Moreover, this method is easy to operate, save labor, save time, and save medicine. When spraying powder, if it is against vegetables, whether spray evenly or not, the effect is very poor. Only uniform air spray, the effect is good. If the air spray is not uniform, some powders will not be well dispersed, and the effectiveness will be reduced. In the greenhouse, a retrograde horizontal dusting method should be adopted, that is, starting from the inner end of the greenhouse, the operator stands in the aisle and faces the doorway of the greenhouse. He sprays the powder and turns back until he exits the door and closes the door. If there is more than one drug, you can put the powder tube into the room from the upper air outlet to spray powder until you finish spraying the powder. In the greenhouse, the swinging spray method shall be used. From the north end, the operator shall swing the dusting tube on the aisle to spray powder on the left and right sides, and then spray it while retreating until it exits the door and closes the door. In the small and medium arch sheds, dusting methods shall be adopted outside the shed, that is, the sheds shall be partially uncovered on different sides of the shed or on both sides of the shed, and the dust-spraying pipe shall be inserted into the shed for dusting. Note that the nozzle swings left and right. Before the dusting, the vents and doors of the booths were closed, and the plastic sheets in the booths were tightly sealed to achieve a closed state.