If long-term, single-use and repeated use of the same kind of pesticides prevent and control the same kind of pests and diseases, there will be a significant reduction or even an ineffective phenomenon of efficacy. This phenomenon is called pest resistance and drug resistance. The resistance of pests and diseases will not only have a serious negative impact on the effectiveness of pesticide plants, but also increase production costs and reduce the effectiveness of prevention and control. At the same time, blind use of pesticides will also cause soil environmental pollution and destroy ecological balance. In order to reduce and prevent the occurrence of drug resistance, the following points must be observed when using pesticides:
Rotation (alternate) medication
A single variety of pesticides will induce drug resistance. The use of biopesticides and antibiotic pesticides in production can be used interchangeably, which can hinder the formation of drug-resistant populations in biological populations. Alternate administration is the use of pesticides that have completely different mechanisms of action during a certain growth period of the plant. Doing so will increase control efficiency and extend the useful life of certain good pesticides. Such as insecticides organic phosphorus preparations, pyrethroids, carbamate preparations, organic nitrogen preparations, biological agents and several major categories, the mechanism of action varies. Pesticide species in the same formulation can also be used interchangeably, but it must be understood whether there is cross-resistance between them.
Rational mixing
Mixing the agents with different modes of action and mechanisms can also slow the development of drug resistance. For example, when crops are resistant to pyrethroid pesticides, the combination of organophosphorus pesticides and pyrethroid pesticides can suppress pest resistance. Single-effect pesticides are used in combination with more traditional pesticides to achieve better results. It should be noted that compounded pesticides cannot be used for a long period of time, be sure to change the medication, otherwise it will also cause drug resistance.
Intermittent medication
If a certain pesticide is found to have produced a large resistance, it should be discontinued or stopped. When an agent has caused drug resistance, if it is stopped for a period of time, the phenomenon of drug resistance may gradually decline or even disappear, such as the resistance caused by monocrotophos. After several years of stopping, the drug resistance basically disappears.
Scientific pesticide application
The effective dose and uniform distribution of pesticides used in the field are of vital importance. For different plants and different pests, proper application techniques should also be selected. Do not increase the dosage and increase the number of medications, so that the use of smaller doses Dosage to obtain better control effect.
Application synergist
Synergists can increase the biological activity of pesticides and increase their efficacy. The addition of a certain amount of synergist to certain pesticides is a very effective way to delay or overcome pests and disease resistance. It is important to note that the synergist used must be a genuine and authentic synergist, not an additive added with a pesticide. For example, the high-profile pesticides synergists in the market are known.
Adhere to comprehensive prevention and control methods
The occurrence of pests and diseases is related to many factors such as soil, climate, cultivation and management, etc. The adoption of a single prevention and control measure, especially chemical control, is likely to produce drug resistance. Pharmacological control, biological control, and force control can be organically combined and comprehensively controlled to achieve the purpose of inhibiting and preventing drug resistance.
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