How to avoid plant pest resistance

Due to repeated use or abuse of pesticides for a long period of time, there have been many kinds of pesticides in the prevention and control of plant diseases and insect pests when the efficacy decline, or even invalid. In order to reduce the occurrence of drug resistance, the following points should be noted when using pesticides: Alternately use pesticides. Alternate administration is the use of pesticides that have completely different mechanisms of action during the growth period of a given plant. It can not only improve the control effect, but also delay the use of a good variety of pesticides. For example, pesticides include organic phosphorus preparations, pyrethroid preparations, carbamate preparations, organic chlorine preparations, and biological preparations, and their action mechanisms are different. Pesticide species in the same type of preparation can also be used interchangeably, but it must be ascertained whether there is cross-resistance between them. In bactericides, it is generally easier to induce drug resistance by ingesting bactericides, such as carbendazim and thiophanate antibiotics. However, the contact bactericide is not likely to cause drug resistance, so it is a better rotation combination. Dyson, inorganic sulfur preparations, and copper preparations are all better varieties. Mixed pesticides in science. Mixing the agents with different modes of action and mechanisms can also slow down the occurrence of drug resistance, and can also cure a variety of diseases and insect pests, enhance drug efficacy, reduce pesticide use, and reduce costs. For example, after the resistance to pyrethroid pesticides, the combination of organophosphorus pesticides and pyrethroid pesticides can have a certain inhibitory effect on pest resistance. In addition, renomycin and mancozeb mix, carbendazim and sterilization Dan mixed, are more successful mixed methods. Once drug resistance has emerged, switching to mixed formulations often works. However, the mixed use must be scientific and reasonable and cannot be blindly mixed. Moreover, a mixed pesticide cannot be used for a long time and it must be used alternately. Otherwise, drug resistance will also occur, and it may also cause the organism to produce resistance to multiple pesticides at the same time. Intermittent use or deactivation of pesticides. When a pesticide has caused drug resistance, if it is stopped for a period of time, the phenomenon of drug resistance may gradually decline or even disappear. For example, after monocrotophos resistance occurs, drug resistance may disappear after several years of use. Apply synergist. Synergists can increase the biological activity of pesticides and increase their efficacy. Therefore, the addition of a certain amount of synergist in certain pesticides can also delay or overcome the occurrence of drug resistance. Currently, 21% of synergistic cyanol concentrates sold on the market have synergists.

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