A pesticide is repeatedly used on the same pest. After a certain period of time, the efficacy is obviously reduced or even ineffective. This phenomenon is that the pest has developed resistance. The emergence of drug resistance forced farmers to increase the dose and frequency of drug use, which just formed a vicious escalation.
1. Causes of drug resistance
(1) Aspects of pests. When subjected to a certain dose of pesticides, some deaths, in which insensitive individuals survive and breed offspring, such offspring are more resistant.
(2) Technical aspects of pesticide use. Improper use of drugs causes resistance: A. Continuous use of a single agent for a long period of time leads to resistance. B. The increased dosage and concentration of pesticides directly lead to enhanced drug resistance. C, the pesticide dosage form is not suitable, it will also reduce the efficacy of the drug, so that the individual is induced to resist drug resistance. D. Pesticides are deposited on vegetables, and uneven distribution may also cause drug resistance.
2, drug resistance prevention measures
(1) Rotation medication. A single variety of pesticides can induce drug resistance, varieties with different rotation mechanisms, and rotation of biological pesticides, antibiotics and pesticides can produce good results.
(2) Mixed medication. The combination of two agents with different modes of action and mechanism can also reduce the occurrence of drug resistance. The single-point pesticide is mixed with traditional pesticides with multiple points, and the effect is better.
(3) Adopt comprehensive prevention and control method. Organically combine measures such as chemical control, artificial control, and quarantine.
(4) intermittent medication. If a pesticide has been found to be highly resistant, it should be discontinued or discontinued.
(5) Adopt the correct application technique. It is essential that the effective dose and deposition distribution of the drug in the field are uniform. Appropriate application techniques should be applied to different vegetables and different pests, and the dosage and frequency of administration should not be easily increased. In addition, pay attention to the use of time, try not to take medicine on cloudy days.
(Wang Tong)
From: Rural Volkswagen
1. Causes of drug resistance
(1) Aspects of pests. When subjected to a certain dose of pesticides, some deaths, in which insensitive individuals survive and breed offspring, such offspring are more resistant.
(2) Technical aspects of pesticide use. Improper use of drugs causes resistance: A. Continuous use of a single agent for a long period of time leads to resistance. B. The increased dosage and concentration of pesticides directly lead to enhanced drug resistance. C, the pesticide dosage form is not suitable, it will also reduce the efficacy of the drug, so that the individual is induced to resist drug resistance. D. Pesticides are deposited on vegetables, and uneven distribution may also cause drug resistance.
2, drug resistance prevention measures
(1) Rotation medication. A single variety of pesticides can induce drug resistance, varieties with different rotation mechanisms, and rotation of biological pesticides, antibiotics and pesticides can produce good results.
(2) Mixed medication. The combination of two agents with different modes of action and mechanism can also reduce the occurrence of drug resistance. The single-point pesticide is mixed with traditional pesticides with multiple points, and the effect is better.
(3) Adopt comprehensive prevention and control method. Organically combine measures such as chemical control, artificial control, and quarantine.
(4) intermittent medication. If a pesticide has been found to be highly resistant, it should be discontinued or discontinued.
(5) Adopt the correct application technique. It is essential that the effective dose and deposition distribution of the drug in the field are uniform. Appropriate application techniques should be applied to different vegetables and different pests, and the dosage and frequency of administration should not be easily increased. In addition, pay attention to the use of time, try not to take medicine on cloudy days.
(Wang Tong)
From: Rural Volkswagen
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