A medicinal agent often has a good insecticidal effect when it is first used, but as the dosage continues to increase and the range of use continues to expand, cases of increased resistance have emerged. The most prominent is esfenvalerate, which is often called "the blessing of justice" in the advertisements of the 1980s, but it can no longer be justified, because even if it is increased by dozens or even hundreds of times, The concentration of the drug also does not kill the pest. This is actually because pests develop resistance, which is the ability to endure the killing of most individuals in the normal population and develop them in their populations.
In fact, individuals with different degrees of sensitivity to pesticides exist in natural pest populations. The use of pesticides is actually the process by which insecticides play a selective role in insect populations. Each time the insecticide is used, the relatively resistant individual will be left behind, killing the relatively sensitive individual, and after the survival of the fittest, the resistance level of the pest population will also be improved.
It has been identified that: (1) drug resistance is related to pests and their living habits. The life history is short, and there are many breeding algebras per year. Pests that have a lot of exposure to pharmaceuticals, such as mites, shells, mites, and mosquitoes, are the most susceptible populations. (2) A pest is resistant to a pesticide and is often resistant to other pesticides of the same type. This interaction is less likely to occur between drugs with different insecticidal mechanisms. (3) The same pesticide is used continuously for a large number of times or a high concentration of treatment, and resistance is formed rapidly, and vice versa.
In general, it is first possible to prevent or delay the rise of pest resistance through rational use of drugs. To this end, it advocates the use of breeding, promotion of resistant varieties, improved cultivation techniques, biological, physical and other technologies for comprehensive prevention and control, to minimize the number of drug control and the amount of drugs. Secondly, it is the choice of pesticide mixing, wheeling and mosaic application with different mechanisms of action. Once again, it is to improve the application of pesticides, such as symptomatic medication, timely spraying, selection of high-efficiency equipment, spraying in place, etc., to maximize the killing effect.
Square Brick Carving,Square Lion Totem Wall Decoration,Smooth Sailing Brick Carving,Welcome Pine Brick Carving
Huaxian Tangyu Garden Landscape Engineering Co., Ltd. , https://www.carvedbricks.com