In the current prevention and control of agricultural pests and weeds, due to the emergence of pesticide resistance, it has brought difficulties to re-control of pests and diseases, has caused damage to the value of agriculture, and has caused some impact on the economic development of farmers. The problem talks about the superficial experience.
I. Resistance of Pesticides to Pesticides Pesticides are the resistance of pesticides to pests to be controlled. Drug resistance can be divided into two kinds: natural resistance and resistance. Natural resistance, also known as drug resistance, is due to differences in biological species, or to different fertility stages of the same species, and different physiological conditions produce different endurances for agents. The resistance is due to the long-term use of a pesticide in the same area, or the use of pesticides with the same mechanism of action to increase the resistance of pests, pathogens or weeds to pesticides. However, chemical control measures are an emergency measure. When the number of objects to be controlled reaches a certain number, which will cause considerable damage to the crops, the use of pesticides will be quick and efficient to control hazards if other measures are not effective. The use of pesticides is necessary, but it must be used sparingly and scientifically, and pesticides should not be used to see pests and weeds. Excessive use of pesticides should be used to increase drug resistance.
Second, pesticide resistance measures
1. Reasonably rotate pesticides. In the course of use, pesticides will inevitably produce drug resistance. The rational use of different types of pesticides is an effective measure to control drug resistance. Rotation of pesticides with different mechanisms of action is an effective method for preventing and delaying drug resistance.
2. The rational use of pesticides and mixed pesticides is not only a measure to delay drug resistance, but also can serve as both a cure, a synergistic effect, a reduction in the dose, and a reduction in costs. However, we must pay attention to reasonable mixing, avoid random use, otherwise it is easy to exacerbate the increase in drug resistance.
3. When a new agent is used, it is imperative to use a new agent when a control object is resistant to a certain agent, which is also a way to overcome drug resistance. The selection of new agents should be agents that do not have cross-resistance to the agents used. It is best to use agents that have negative effects. Replace the new agent, but also pay attention to reasonable use, otherwise the same resistance to drug production.
4. Adding synergist, synergist itself is generally non-toxic to the control object. Adding a certain amount of synergist to some kinds of pesticides can make the pharmacy show obvious synergistic effect.
5, Comprehensive prevention and control, there are many kinds of pathogens, pests, and weeds that harm crops, and the conditions for the occurrence of harm are very different. It is difficult to completely solve the problem through prevention and control alone.
The various control measures currently used have their advantages and disadvantages. Prevention and control of pests and weeds cannot rely solely on one measure. They must be adapted to local conditions and organically combine agricultural technology, chemical control, biological control, and physical control measures. The plant protection policy based on prevention and integrated prevention can effectively, economically and safely control the damage of pests and weeds. It not only effectively protects biodiversity and ecological environment, but also promotes the sustainable development of agriculture and ecology.
I. Resistance of Pesticides to Pesticides Pesticides are the resistance of pesticides to pests to be controlled. Drug resistance can be divided into two kinds: natural resistance and resistance. Natural resistance, also known as drug resistance, is due to differences in biological species, or to different fertility stages of the same species, and different physiological conditions produce different endurances for agents. The resistance is due to the long-term use of a pesticide in the same area, or the use of pesticides with the same mechanism of action to increase the resistance of pests, pathogens or weeds to pesticides. However, chemical control measures are an emergency measure. When the number of objects to be controlled reaches a certain number, which will cause considerable damage to the crops, the use of pesticides will be quick and efficient to control hazards if other measures are not effective. The use of pesticides is necessary, but it must be used sparingly and scientifically, and pesticides should not be used to see pests and weeds. Excessive use of pesticides should be used to increase drug resistance.
Second, pesticide resistance measures
1. Reasonably rotate pesticides. In the course of use, pesticides will inevitably produce drug resistance. The rational use of different types of pesticides is an effective measure to control drug resistance. Rotation of pesticides with different mechanisms of action is an effective method for preventing and delaying drug resistance.
2. The rational use of pesticides and mixed pesticides is not only a measure to delay drug resistance, but also can serve as both a cure, a synergistic effect, a reduction in the dose, and a reduction in costs. However, we must pay attention to reasonable mixing, avoid random use, otherwise it is easy to exacerbate the increase in drug resistance.
3. When a new agent is used, it is imperative to use a new agent when a control object is resistant to a certain agent, which is also a way to overcome drug resistance. The selection of new agents should be agents that do not have cross-resistance to the agents used. It is best to use agents that have negative effects. Replace the new agent, but also pay attention to reasonable use, otherwise the same resistance to drug production.
4. Adding synergist, synergist itself is generally non-toxic to the control object. Adding a certain amount of synergist to some kinds of pesticides can make the pharmacy show obvious synergistic effect.
5, Comprehensive prevention and control, there are many kinds of pathogens, pests, and weeds that harm crops, and the conditions for the occurrence of harm are very different. It is difficult to completely solve the problem through prevention and control alone.
The various control measures currently used have their advantages and disadvantages. Prevention and control of pests and weeds cannot rely solely on one measure. They must be adapted to local conditions and organically combine agricultural technology, chemical control, biological control, and physical control measures. The plant protection policy based on prevention and integrated prevention can effectively, economically and safely control the damage of pests and weeds. It not only effectively protects biodiversity and ecological environment, but also promotes the sustainable development of agriculture and ecology.
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