Scientific application of pesticides to reduce pest resistance
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2, mixed medication. The combination of two pesticides with different modes of action and mechanism can slow the occurrence of pest resistance. Even if drug resistance has been formed, the mixed drug can inhibit the drug resistance. At present, the successful combination of drugs is: trichlorfon, dichlorvos and malathion; pyrethroid insecticides mixed with organophosphorus pesticides; trichlorfon and phoxim, methyl parathion Mixed; oil emulsion mixed with organophosphorus pesticides. It must be noted that mixed pesticides can not be applied alone for a long time, and they should be rotated. Otherwise, there is also a risk of causing drug resistance, and even causing multi-resistance of pests.
3. Intermittent application or deactivation of pesticides. When a pesticide has already induced resistance to a certain pest, such as stopping the application of the pesticide for a period of time, the resistance of the pest will gradually decrease or even disappear. If parathion causes resistance to red spiders, the resistance of spider mites can almost disappear after several years of inactivity. In this way, the effect of the medicament can still be restored.
4. Add synergists. Adding a synergist to the pesticide can obviously activate the pesticide, improve the efficacy, delay and inhibit the resistance of the pest. For example, adding a small amount of diesel to the omethoate to prevent scale insects can dissolve the shells and make the pesticides enter the pests, overcoming the resistance of the scale insects to omethoate. In addition to oily substances, commonly used synergists are neutral detergents, soy milk, vegetable oils and the like.
5. Diversified application methods. In addition to the conventional spraying, the method of applying pesticides may be carried out by other methods, such as mixing contaminated soil, making bait, applying soil, applying medicine, dropping medicine, injecting medicine, etc., and different medication methods alternately, which helps prevent and Overcome pests to develop resistance.
6. Develop application of soil pesticides. The soil pesticide raw materials are widely used, and the preparation is simple, and the pests are not induced to resist. At present, the soil pesticides to be developed are mainly plant pesticides such as tobacco, ramie and garlic. In addition, washing powder, oil, quicklime, caustic soda, rosin, etc., are also good raw materials for soil-based pesticides.