Pesticide resistance and preventive measures

In the current pesticide control of agricultural pests and diseases, due to the emergence of pesticide resistance, it has brought difficulties to re-control pests and diseases, causing damage to the value of agriculture, and partly affecting the economic development of farmers. The problem talks about the shallow experience.
First, pesticide resistance

The resistance of pesticides refers to the resistance of pests and diseases to the pesticides. Drug resistance can be divided into two types: natural resistance and resistance. Natural resistance, also known as drug resistance, is due to differences in biological species, or different growth stages of the same species, and different physiological states produce different endurance to the agent. Obtaining resistance is due to the long-term use of a single pesticide in the same area, or the use of pesticides with the same mechanism of action, so that the resistance of pests, germs or weeds to pesticides is improved. However, the chemical control measures are an emergency measure. When the number of objects to be controlled reaches a certain amount, which will cause considerable harm to crops, and the other measures are difficult to be effective, the characteristics of the pesticides are quickly and efficiently controlled to control the hazards. The use of pesticides is necessary, but it must be used sparingly and scientifically. It is not possible to use pesticides at the sight of pests and diseases, and the number of pesticides is used too much to increase the resistance.

Second, pesticide antibiotic prevention measures

1. Rational use of pesticides. In the process of using pesticides, it is inevitable to produce drug resistance. Reasonable rotation of different types of pesticides is an effective measure to control drug resistance. Different mechanisms of action are effective methods for preventing and delaying drug resistance.

2, reasonable mixed use, pesticides mixed, not only a measure to delay drug resistance, but also can play a role in concurrent treatment, efficiency, reduce the amount of drugs, reduce costs. However, it is necessary to pay attention to reasonable mixing and avoid random use, otherwise it will easily aggravate the increase of drug resistance.

3, the use of new drugs, when a control object against a certain drug resistance, the use of new drugs is imperative, but also a way to overcome drug resistance. The selection of the new agent should be an agent that does not have cross-resistance with the original agent, and it is preferable to use a drug having a negative cross-resistance. For the new drug to be used, it is also necessary to pay attention to the rational use, otherwise the drug resistance is also easy to produce.

4. Add synergist, the synergist itself is generally non-toxic to the control object, and adding a certain amount of synergist to some kinds of pesticides can make the agent show obvious synergistic effect.

5. Comprehensive prevention and control, there are many kinds of germs, pests and weeds that endanger crops, and the conditions for the occurrence of hazards are very different. It is difficult to solve the problem completely by a single measure in prevention and control.

The various control measures currently used have their advantages and disadvantages. The prevention and control of pests and diseases cannot be based on one measure. The measures of agricultural technology, chemical control, biological control and physical control should be organically combined and implemented. The plant protection policy of prevention-oriented and comprehensive prevention can effectively control the pests and diseases of the pests and diseases in an effective, economical and safe manner, effectively protecting the biodiversity and ecological environment, and promoting the sustainable development of agriculture and ecology. (Benxi County Plant Protection Station, Liaoning Province)

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