The occurrence and relief of pesticide resistance
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, then look at how experts make pesticide resistance slow down.
First, the rotation of drugs should not be used for a long time to use a certain pesticide to control certain pests, so that the formation process of pest-resistant populations 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. (In-depth analysis of science uses pesticides to reduce drug resistance)
Second, the mixed use of two different modes of action and the use of pesticides mixed with different mechanisms, can slow the occurrence of pest resistance, even if drug resistance has been formed, mixed drugs 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.
It must be noted that the mixed pesticides can not be used for a long time alone, and should be rotated. Otherwise, there is also a risk of causing drug resistance, and even the pests may cause multiple drug resistance.
3. Intermittent use or deactivation of pesticides When a pesticide has already caused resistance to certain pests, if the pesticide is stopped 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.
4. Adding synergist Adding 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.
V. Diversified application methods The use of pesticides In addition to conventional spraying, other methods can be used, such as mixing toxic soil, making bait, soil application, applicator, dripping, smoking, etc. Different methods of administration Alternating to help prevent and overcome the resistance of pests.
More pesticide knowledge , please pay attention to China Pesticide Network
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