Pesticides can be used fumigation method

Smoke smoke produced by the use of pesticides to combat pests application methods . This law applies to the control of pests and diseases, rodent control and sometimes this method can also be taken , but not for weed control . Cigarette is suspended in the air of the solid fine particles, the important feature is the ability to self- diffusion space , chemical sprayer the air flow disturbance , can spread to a larger space and in a far distance , the settlement slow prills can be deposited all parts of the target body , including the back of leaves , thus better control effect . Fumigation method is mainly used in small enclosed environments such as warehouses , buildings , greenhouses, plastic greenhouses and large tracts of forest and orchard . The main impact of fumigation efficacy factors airflow five points:
① updraft so smoke escaping the upper space , can not be stuck in the ground or crop surface , so the day can not be exposed to fumes ;
② inversion , sunset, surface ground or crop will be released in calories , so that near the surface of the ground or crop or crop the air temperature is higher than ground surface temperature , which is conducive to retention of the smoke does not escape very quickly , so in the evening and early morning to put cigarettes are easily succeed ;
③ The wind will change the flow of smoke and running speed and breadth of smoke in the wind when you put a small can achieve better control effect ;
④ sea breeze and land breeze in the adjacent waters of the land , the morning wind blows from the land surface of the water , that the breeze ; evening wind blowing from the land surface ,hand pump sprayers that the sea breeze . Alternating in the sea breeze and land breeze during the ground appeared calm wind zone ;
⑤ easy to smoke low-lying land , cold region is relatively concentrated . Study, the airflow and topography, can be successfully used in the open method of fumigation .