Purpose of pesticide mixing and rotation 5

1. Expand the control object: there are often a variety of diseases, insects and weeds that need to be controlled at the same time on a crop. A single dose often fails to achieve the effect, such as the gram multi-sub treatment agent, which is mixed with carbofuran and carbendazim in a certain proportion.

The aim is to control aphids and diseases at the seedling stage of cotton. Another situation is to control the different stages of the same kind of object, such as the nongsaurus pill is composed of cytophrine vinegar and salivarione, which can kill eggs and mites, and has an effective control effect on different insect states in the whole development stage of leaf snails. Sometimes a pesticide may be used for different crops.

2. Improve the available azole: some pesticides have poor quick action, such as insect growth regulators. In some cases, pesticides are required to have strong knockdown activity, especially the control of sanitary pests, in order to improve the rapidity of pesticides, pesticides with poor fast-acting properties are often mixed with fast-acting agents.

For example, the mixture of fluorobolin gills and phosphine, the mixture of amine vinegar and cypermethrin vinegar, the quick-acting effect of phosphine is significantly stronger than that of fluorine vein, and amine chrysanthemum vinegar has strong knockdown activity.

3. Increase the control effect and reduce the control cost: the mixing of two or more pesticides may cause various changes. In terms of the impact on organisms, it can be divided into the following three types, namely, synergistic effect, antagonistic effect and additive effect.

For target pests, it is required to have a synergistic effect after mixing. Sometimes it is considered that the combination of other traits can be additive, at least not antagonistic. Most fungicides and insecticides are mainly used in combination to expand the control object, such as most seed coatings are mainly considered underground pests and soil-borne and seed-borne diseases, as well as pests and diseases at the seedling stage.

Due to the synergistic effect of the mixture, the dosage is reduced, and at the same time, the expansion of the control object reduces the number of pesticide applications. Reduced labor costs. At least there should be no synergistic effect on higher animals, and of course, antagonistic mixtures are best for higher animals.

4. Delay the emergence of drug resistance in control objects: Delaying the emergence of drug resistance in control objects is also a major purpose of pesticide mixing. The mixing of different types of agents forms a multi-site mechanism of action, which makes the target not easy to develop resistance, and this phenomenon is mainly used between different mechanisms of action and the same category.

For example, between insecticides with different mechanisms of action, between fungicides with different mechanisms of action, etc., and whether the mixing of large classes of agents such as insecticides and fungicides can delay the development of drug resistance in the target needs to be further studied and proven.

In a word, it is to increase the insecticidal effect and reduce the resistance of pesticides.

It is mainly to prevent or delay the development of pest resistance to ensure the effectiveness of insecticide control.

In a certain area, the long-term use of a single insecticide may gradually "adapt" to the toxicological effects of the insecticide in the process of "fighting" the insecticide, resulting in the gradual weakening of the insecticide's killing effect on the pest.

Frequent rotation of pesticides with different mechanisms of action can help prevent the development of resistance or delay the development of resistance.