Experience exchange
Spraying powder to prevent diseases in greenhouse vegetables does not increase the humidity in the greenhouse. Because the dust drifts for a long time, the grains 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. Control effect. At the same time, spraying powder does not need to add water, is not limited by water sources, and saves labor, time, and medicine. The following five points should be taken into account during specific operations:
First, choose the right pharmaceutical powder. For the control of cucumber downy mildew and tomato late blight, 10% antifungal agent or 5% chlorothalonil powder was selected; for control of cucumber anthracnose and black heart disease, 5% chlorothalonil or 12% Kekeling powder was selected; Control cucumber bacterial angular spot, choose 10% of B powder; prevent vegetable mold, leaf mold, early blight and late blight, choose 12% of the powder.
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 effectiveness of dusting is reduced.
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. If greenhouses are used, the horizontal spraying method is used, that is, starting from the inside of the greenhouse, the operators stand on the aisle, facing the northern wall of the greenhouse and face the south side. They spray back 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. If it is a plastic greenhouse, the use of left and right air swing spray method, that is, from the northern end, the operator stood in the corridor swing powder tube spraying powder to the left and right sides, while spraying, while retreating, until exiting the southern end of the door, shut the door. In the case of small and medium arch sheds, the method of spraying outside the shed is used to open the shed on one or both sides of the shed. The spray pipe is projected into the shed to spray it, and the nozzle sways.
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 followed. Operators are required to wear long-sleeved work clothes, goggles, masks and protective caps. After the work is completed, the hands and other exposed parts must be cleaned.
plastic medical collectors
Guangdong Widinlsa International Co.Ltd , https://www.widinlsa.com