The emergence of drug resistance not only has a serious negative impact on the efficacy of pesticides, but also causes an increase in production costs, a reduction in control effects, and also affects the ecological balance of nature due to blind medication. Therefore, in order to reduce the occurrence of plant resistance, the following points should be noted when using pesticides:
1. Alternate use of pesticides should not use a single variety of agents for a long period of time, which can cut off the formation process of resistant populations in biological populations. Alternate medication is the use of pesticides with completely different mechanisms of action during a certain growth period of the plant. This will not only improve the effectiveness, but also extend the useful life of certain excellent pesticides.
For example, pesticides such as organophosphorus preparations, pyrethroid preparations, carbamate preparations, organic nitrogen preparations, and biological preparations have different mechanisms of action. Pesticide varieties in the same type of preparation can also be used interchangeably, but it is necessary to find out whether there is cross-resistance between them. For example, after the mites have become resistant to dimethoate, dichlorvos can no longer be used, because mites also develop resistance to dichlorvos. But you can choose to kill pine.
Among the bactericides, general systemic bactericides are relatively susceptible to drug resistance, such as benzimidazole insecticides (carbendazim, thiophanate, etc.), antibiotic fungicides, and the like. However, contact fungicides are less likely to cause drug resistance, so the best combination of rotations. For example, Daisen, inorganic sulfur preparations, and copper preparations are all good varieties.
2. Rational mixing of pesticides The combination of agents with different modes of action and mechanisms can also slow down the rate of drug resistance. It is a good way to overcome the resistance of pests; it can also cure multiple pests and diseases, enhance the efficacy of drugs, and reduce the amount of pesticides. cut costs. For example, after resistance to pyrethroid pesticides, the combination of organophosphorus and pyrethroid pesticides can have a de facto inhibitory effect on pest resistance.
In addition, such as the combination of dystrophin and mancozeb, mixed with carbendazim and sterilized dan, mixed with organophosphate and pyrethroid, are all successful mixed solutions. Once drug resistance occurs, switching to a mixed formulation can often work. However, the combination of agents used in combination must be carefully studied and cannot be mixed blindly.
It should be noted that compound pesticides cannot be used singly for a long time, and it is necessary to organize the rotation of drugs. Otherwise, there is also a risk of causing drug resistance, and it may also cause harmful organisms to simultaneously develop resistance to various pesticides.
3. Intermittent use or deactivation of pesticides When a pesticide has already caused drug resistance, if it is stopped for a period of time, the drug resistance may gradually decrease or even disappear. For example, the resistance caused by monocrotophos can be basically eliminated after several years of inactivity.
4, the application of synergist synergist can increase the biological activity of pesticides and improve drug efficacy. Therefore, the addition of a certain amount of synergist to certain pesticides can also delay or overcome the resistance of pests. In addition to malathion and fenvalerate, there are synergists in the 21% synergistic cyanoma emulsifiable concentrates currently on the market.
In addition, the effective dose of the agent and the uniformity of the precipitation distribution are also crucial for the control of pests and diseases. Therefore, appropriate application techniques should be applied to different plants and different pests to evenly distribute the agent on the plants. Therefore, a better control effect can be obtained with a smaller amount.
1. Alternate use of pesticides should not use a single variety of agents for a long period of time, which can cut off the formation process of resistant populations in biological populations. Alternate medication is the use of pesticides with completely different mechanisms of action during a certain growth period of the plant. This will not only improve the effectiveness, but also extend the useful life of certain excellent pesticides.
For example, pesticides such as organophosphorus preparations, pyrethroid preparations, carbamate preparations, organic nitrogen preparations, and biological preparations have different mechanisms of action. Pesticide varieties in the same type of preparation can also be used interchangeably, but it is necessary to find out whether there is cross-resistance between them. For example, after the mites have become resistant to dimethoate, dichlorvos can no longer be used, because mites also develop resistance to dichlorvos. But you can choose to kill pine.
Among the bactericides, general systemic bactericides are relatively susceptible to drug resistance, such as benzimidazole insecticides (carbendazim, thiophanate, etc.), antibiotic fungicides, and the like. However, contact fungicides are less likely to cause drug resistance, so the best combination of rotations. For example, Daisen, inorganic sulfur preparations, and copper preparations are all good varieties.
2. Rational mixing of pesticides The combination of agents with different modes of action and mechanisms can also slow down the rate of drug resistance. It is a good way to overcome the resistance of pests; it can also cure multiple pests and diseases, enhance the efficacy of drugs, and reduce the amount of pesticides. cut costs. For example, after resistance to pyrethroid pesticides, the combination of organophosphorus and pyrethroid pesticides can have a de facto inhibitory effect on pest resistance.
In addition, such as the combination of dystrophin and mancozeb, mixed with carbendazim and sterilized dan, mixed with organophosphate and pyrethroid, are all successful mixed solutions. Once drug resistance occurs, switching to a mixed formulation can often work. However, the combination of agents used in combination must be carefully studied and cannot be mixed blindly.
It should be noted that compound pesticides cannot be used singly for a long time, and it is necessary to organize the rotation of drugs. Otherwise, there is also a risk of causing drug resistance, and it may also cause harmful organisms to simultaneously develop resistance to various pesticides.
3. Intermittent use or deactivation of pesticides When a pesticide has already caused drug resistance, if it is stopped for a period of time, the drug resistance may gradually decrease or even disappear. For example, the resistance caused by monocrotophos can be basically eliminated after several years of inactivity.
4, the application of synergist synergist can increase the biological activity of pesticides and improve drug efficacy. Therefore, the addition of a certain amount of synergist to certain pesticides can also delay or overcome the resistance of pests. In addition to malathion and fenvalerate, there are synergists in the 21% synergistic cyanoma emulsifiable concentrates currently on the market.
In addition, the effective dose of the agent and the uniformity of the precipitation distribution are also crucial for the control of pests and diseases. Therefore, appropriate application techniques should be applied to different plants and different pests to evenly distribute the agent on the plants. Therefore, a better control effect can be obtained with a smaller amount.
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