Dust application technology is the processing of pharmaceuticals and their accessories into very fine ultrafine particles, by means of dusting method to make ultrafine pesticide particles in the formation of floating dust, the use of dust "running effect" and "Brown movement" Pharmacopoeia produces uniform multi-directional deposition on the vegetable plants in the protected area. 1 The main advantages 1) obvious control effect. Evenly distributed, good adhesion. Dust flow for a long time, the drug particles can be deposited in various parts of the plant, but also spread to the hidden parts of the plant distribution, even if the protected area is not strict, does 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. 2) Improved farmland microclimate. The conventional spraying method has a large amount of water, which increases the humidity of the air in the protected area and creates favorable conditions for the infection of pathogenic bacteria. As a result, the disease is getting heavier and heavier, especially in the case of continuous cloudy days, the control is extremely inconvenient. Using the aerosol fumigation method, the medicament is easily decomposed under high temperature to reduce the efficacy, and harmful gases are generated in the combustion process, which is not conducive to the growth of vegetables, and the dust method does not increase the humidity in the greenhouse, but also imposes strict requirements on the closed conditions of the protected area. In the prevention and treatment of pests at the same time, create suitable environmental conditions conducive to robust growth of vegetables. 2 Pharmacy selection The common dust agents are the following: 1) 5% chlorothalonil dust. For the control of various vegetables downy mildew, anthrax, early blight, late blight and so on. 2) 5% downy mildew dust. For the control of various vegetables, downy mildew, damping-off and cucumber blight, tomato late blight and so on. 3) 6.5% moldolin dust. Used to control various vegetables such as gray mold, leaf mold and anthrax. 4) 10% anti-mildew spirit dust. For the control of cucumber downy mildew, tomato late blight and so on. 5) 12% Charcoal dust. For the control of cucumber anthracnose, black spot disease. 6) 12% benefit from dust. It is used to control various vegetables such as gray mold, leaf mold, early blight and late blight. 7) 10% B dust. For the control of bacterial bacterial leaf spot disease and other bacterial diseases. 8) 5% extermination of dust. For the control of aphids, whitefly and other pests. 3 Operational procedures 1) Medical preparation. The use of domestic harvest 5 or harvest 10 duster, according to its standard amount of dust into the kit, adjust the discharge volume of 200 g/min (minutes). 2) Close the tuyere. Before the spraying, close the vent on the protective floor and close the door on one end. 3) Spraying in solar greenhouses. Spraying personnel standing on the walkway on the north side of the greenhouse, back to the northern wall of the greenhouse, starting from the north, sprinkled southwards, swinging up and down the spray tube with different heights. When using the harvester type 5 duster, the rotation speed should reach 35 rpm. When using the harvester type 10 duster, the rotation speed should reach 50 rev/min (minutes), so that the nozzle of the spray nozzle can generate enough wind power. Dispense the powder thoroughly. 4) spraying in the greenhouse. The applicators stood on the aisle in the middle of the shed and began spraying powder from the inside of the shed. The powder spraying pipe oscillated to the right and left, retraced toward the door, and returned to the exit. Finally, the door was closed. 5) Spraying in small arches. In many areas of China, small sheds used for planting leeks and other dwarf vegetables are generally less than 1 m in height. It is difficult for spraying personnel to spray pesticides into the shed. At this time, a small opening at a certain distance can be opened outside the shed to spray dust. Put the tube into it and shake the dusting tube to spray powder. After the spray is finished, cover the film tightly. 4 Precautions 1) Dust preparation must be used. Do not use wettable powder instead of dust. 2) Dosing must be done using a duster. Do not replace it with other instruments. 3) The duster and dust must be kept dry. Do not use wet or agglomerated chemicals. 4) The spraying time is best in the evening, which can not only improve the control effect, but also does not affect the agricultural work in the shed. Rainy days can be sprayed all day, after the spray should be sealed 2-3 h (hours) or more. 5) Do not spray for 3 days (days) after spraying, so as not to flush away the powder and reduce the efficacy. 6) Spraying is usually started before the onset of disease or early onset, and then sprayed once every 7-10 days (days). Spraying is repeated 2-3 times depending on the condition.
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