Why is the insecticide more and more ineffective?

An insecticide is often effective at first, but as the dosage increases and the scope of use expands, the drug becomes less effective, which is actually because the pest develops resistance. A pest that develops resistance to one pesticide tends to be resistant to other pesticides of the same type; such interactions are not easy to occur between drugs with different insecticidal mechanisms. The resistance of the same pesticide developed quickly when it was used continuously for many times or at high concentration, and vice versa.

Therefore, first of all, we should minimize the number and dosage of chemical control.

Second, the selection of pesticide mixtures, rotations and mosaic applications with different mechanisms of action.

Third, it is to improve the application technology, such as symptomatic application, timely spraying, selection of efficient machinery, spraying in place, etc., to improve the killing effect as much as possible.