Smoke pesticide, also known as smoke agent, smoke agent, is a pesticide formulation widely used in vegetable producing areas。A powdered or ingot preparation made from a raw drug, fuel, oxidizing agent, or flame retarder。

        When ignited, pesticides can be heated and vaporized, condensing into solid smoke in the air to produce drug effects。Among the varieties of tobacco agents, fungicides are the main ones, accounting for about80%The rest are pesticides, which are mainly used for the control of forest, greenhouse and greenhouse plant diseases and pests, as well as warehouse pests。

　　Smoke is very effective, but it can also cause damage when used incorrectly。The preparation of tobacco agent must fully understand the nature of pesticides and be able to analyze and measure the smoke formation of tobacco agent, otherwise the decomposition loss of pesticides is great。The dosing method of the smoke agent should also be noted。

　　The correct method should first prepare the smoke agent into a certain shape, or pack it in a suitable container, such as a paper smoke can。Leave a smoke hole on the top of the tank, fill the smoke agent in the tank, after lighting, the smoke quickly ejected from the top hole, all shot into the air。

　　This usage can avoid the smoke being adsorbed by the ground, and can promote the rapid diffusion of smoke。It is also convenient to use the smoke agent in sheets or chunks, but do not place the smoke sheet or smoke block directly on the ground when using it. The smoke sheet should be placed on the top of a wire support, off the ground30Centimetre or so。In this way, the smoke can be completely dispersed into the air and further spread。

　　The law of airflow movement should be mastered when using smoke method。Updraft occurs when the ground temperature is higher than the air temperature。On a clear day, the sun shines on the ground and warms the ground, so the updraft is significant during the day, especially at noon。In the evening, the ground is no longer illuminated by the sun, the ground begins to release heat, and the heat released is absorbed by the upper air, so the phenomenon that the ground temperature is lower than the upper air temperature occurs at this time, that is“逆温”现象。

　　在“Thermal inversion layer”Within the range of the updraft phenomenon disappeared。At this time, the smoke can form a more stable“烟云”Covered on the ground, the effect is better。Therefore, the smoke in the evening can avoid the disturbance of updraft。When the canopy of the plant grows thick, it forms“冠盖”When combined with temperature inversion, good smoke effect can often be obtained。When the smoke is released, the cloud will overwhelm the entire canopy and last for some time。

　　In forests and orchards with high canopy, and in field crops with tall and closed canopy, the use of smog method can achieve remarkable control effect。（转）