Shelter pests, drug resistance, disease prevention
In the production and production of greenhouses, a pesticide is repeatedly used on the same kind of pest. After a certain period of time, the efficacy of the pesticide is significantly reduced or even almost ineffective. This phenomenon means that the pest has developed drug resistance. The emergence of drug resistance forced the vegetable grower to increase the amount of drugs and the number of medications, which in turn formed a vicious cycle.
Causes of drug resistance
1. Pests: Some individuals die after being exposed to a certain amount of pesticides, in which insensitive individuals survive and breed offspring, and the resistance of such offspring is stronger.
2. The use of pesticides: mainly caused by improper use of drugs:
(1) Long-term continuous use of a single agent leads to resistance. (2) Increased doses and concentrations of pesticides directly lead to enhanced drug resistance. (3) The formulation of the pesticide is not suitable, and it will also reduce the efficacy so that the individuals who missed the pesticide will induce drug resistance. (4) Pesticides are deposited on vegetables, and uneven distribution can cause drug resistance.
Drug resistance preventive measures
1. Rotational drug use: single species of pesticides will induce drug resistance, rotation of different varieties of the mechanism, rotation of biological pesticides, antibiotic pesticides, can produce good results.
2. Mixed drug use: The combination of two drugs with different modes of action and mechanisms can also reduce the occurrence of drug resistance. Single point of action pesticides are used in combination with more traditional pesticides, and the effect is better.
3. Adopt a comprehensive prevention and control law: organically combine measures for the prevention, control, and quarantine of medicines.
4. Intermittent drug use: When a certain pesticide has been found to have produced a great resistance, it should be interrupted or stopped.
5. Adopt the correct method of pesticide application: The effective dose and uniform distribution of pesticides in the field are crucial. Appropriate application techniques should be selected for different vegetables and different pests. Do not easily increase the dosage and use of pesticides. frequency.
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