Pesticides are used to control the pests and diseases of crops. However, when a pesticide is used for a long time, the effect of the drug will gradually decrease. This is because the pests and diseases have become resistant to the pesticide, and this is The "life" of pesticides, how to make pesticide resistance slow down?
Rotation medication
Do not use a certain pesticide for a long time to control a certain pest, so that the formation process of the pest-resistant population can be cut off. Varieties with different mechanisms of action should be used as far as possible for the varieties used for rotation. Such as organophosphorus pesticides, pyrethroid pesticides, carbamate pesticides , biological pesticides, etc., the insecticidal principles are different, can be used interchangeably. The rotation of the same type of pesticide should be used with caution, because the pest is easy to obtain cross-resistance, that is, after resistance to a certain pesticide, it will also be resistant to other varieties of the same kind.
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. Previously, successful solutions for mixed drugs were: mixed with pyrethroid insecticides and organophosphorus pesticides; trichlorfon was mixed with phoxim; and oil emulsions were mixed with organophosphorus pesticides.
Intermittent use
When a pesticide has already caused resistance to a certain pest, such as stopping the use of the pesticide for a period of time, the resistance of the pest will gradually decrease or even disappear. For example, some organophosphorus pesticides cause resistance to red spiders. After several years of inactivity, the resistance of spider mites can almost disappear. In this way, the effect of the medicament can still be restored.
Add synergist
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 control the scale insects can dissolve the clam 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.
Diversified application
In addition to the conventional spray, other methods, such as mixing toxic soil, making bait, soil application, applicator, dripping, smoking, etc., can be used in different ways. Overcome pests to develop resistance.
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