Powder spraying method to prevent vegetable diseases
The dusting method is used to prevent vegetable diseases in the facility and does not increase the humidity in the greenhouse. Because the dust drifts for a long time, the granules can be deposited in various parts of the plant, and they can spread to hidden areas of the plants. Even if the protected area is not closed tightly, it will not affect the control. effect. At the same time, it is easy to operate, save labor, save time, and save medicine. Spraying powder does not need to add water, is not limited by the water source, the spraying time is short, and the time between medications is long, the medication is less, and the utilization rate of pesticides is higher. The following five points should be taken into account during specific operations:
First, 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 of cucumber bacterial angular spot, use 10% of the B dust agent; Prevention of vegetable mold, leaf mold, early blight and late blight, use 12% of the benefits of dust.
Second, 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, 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, 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.
Greenhouse: Using the horizontal reflow method, that is, starting from the inside of the greenhouse, the operators stand in the aisle, facing the northern wall of the greenhouse and face the south side. They sprinkle the air and retreat until they exit the door and close the door. If there is residual medicine, the powder spray tube can be sprayed into the room from the upper air outlet and sprayed until the residual drug is sprayed.
Greenhouses: Using left-right swing spray method, starting from the north end, the operators stood on the aisle and sprayed dusting pipes to spray powder on both sides. While spraying, they retraced and retraced until exiting the south entrance and closing the door.
Small and medium arch sheds: The shed is sprayed on the outside of the shed. The shed is partially uncovered on one or both sides of the shed, and the dusting pipe is inserted into the shed for spraying. The spray pipe sways from side to side.
Fifth, pay attention to matters. Before the dusting, the vents and doors of the booths shall be closed, and the plastic sheets in the booths shall be tightly closed to achieve a closed state as far as possible. If there is a small piece of the tented cloth, it will not affect the dust.
When operating, pesticide safety operation regulations shall be observed. Wear long-sleeved overalls, wear goggles, masks, and protective caps. After the work is completed, you must wash your hands and other exposed parts.
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