Pesticide mixing mainly refers to the combination of two liquid pesticide preparations and becomes a liquid spray. Reasonable mixture of pesticides can expand the field of use or treat several pests, which can improve work efficiency; some can even increase the efficacy and reduce the side effects of pesticides such as drug resistance and phytotoxicity. However, pesticides should be mixed reasonably.
Pay attention to the following issues when mixing pesticides:
1. The chemical consolidation of the active ingredients affects the consolidation of the active ingredients. Common organic phosphates, carbamates, pyrethroid vinegar insecticides, the active ingredients are all "esters", usually alkaline More sensitive, it will hydrolyze in alkaline media. Dithiocarbamate fungicides such as thiram and daisen ring, the active ingredients are damaged in a complex chemical process in an alkaline medium. Some pesticide varieties are relatively solid under weak alkaline conditions, but they should be used immediately after they are formulated into weak alkaline liquids. It should not be placed for too long. Therefore, mixing with alkaline drugs must be cautious. Common alkaline fertilizer ammonia, ammonium bicarbonate, calcium phosphate and so on. Some pesticide active ingredients will decompose under acidic conditions or reduce the efficacy. Such as 2,4-D sodium salt, 2 methyl 4-chloro sodium salt, amitraz and the like. Common acidic agents include copper sulfate, nicotine sulfate, antibacterial agent 401, and ethephon.
Many organophosphate pesticides also carry acidity, such as acesulfame, dichlorvos and the like. The stereoactive configuration of beta-cypermethrin and lambda-cyhalothrin (fungimethrin) is more stable than a single active ingredient in a narrow pH range. The medium is acidic and easy to decompose, and the medium is alkaline. Decreased efficacy. In addition to acid and alkali, many pesticide varieties cannot be mixed with metal ion-containing drugs. The dithiocarbamate fungicide, the 2,4-D salt herbicide and the copper preparation can be complexed with copper ions to lose activity. Remove copper preparations, other heavy metal ion-containing preparations such as iron, zinc, manganese, nickel, etc., and be careful when mixing.
2, to ensure that the physical properties of the liquid emulsifiable emulsion preparation should have good emulsifying properties after water. The two kinds of emulsifiable liquids are also pleading for good emulsifying properties, and there is no possibility of emulsification or even stratification, oil slick, accumulation and the like. The medicinal liquid mixed with the wettable powder is also required to have good suspension properties, and the flocculation and accumulation cannot be seen. The physical properties of the liquid medicine after mixing are obviously deteriorated and cannot be mixed, so as to avoid reduction, failure or even phytotoxicity. When the pesticide emulsifiable concentrate or wettable powder is processed and produced, it is only considered that the preparation has a good physical property for the water, and it is impossible and practically impossible to mix the preparation with any other preparations, and the physical properties of the liquid must be good.
3, to ensure that the occurrence of chemical damage such as phytotoxicity, the chemical changes of the active ingredients may produce phytotoxic substances, the mixture of stone sulphur and Bordeaux mixture can produce harmful copper sulfide, and also increase the soluble copper ions. The dithiocarbamate fungicides described above produce harmful substances either in an alkaline medium or in combination with a copper preparation. If the mixed use causes the physical properties of the liquid to deteriorate, such as milky demulsification and the emergence of oil slick, it will inevitably cause phytotoxicity. The cockroach is used in rice fields to control valerian, because an amidase in rice plants can decompose the effective components of the cockroach. Organic phosphorus and carbamate pesticides can inhibit this kind of enzyme in rice. They can not be mixed with the enemy, and they can not be used together within 10 days before or after. Otherwise, it will cause phytotoxicity, and beetamine with the same amide as the enemy. This problem also exists with herbicide varieties.
4, the pesticide network suggests that pesticides should also be noted:
1) The current mixed use of pesticides can be used according to the occurrence of crop pests and the control of maneuvering. This is a basic requirement in the use of pesticides. However, frequent or widespread pesticide blending is often made into a blend when the pesticide is processed. Mixtures Generally speaking, the effective ingredients are more scientific and reasonable. The physical and chemical properties of the preparations should be better than those of the existing ones. Some solid preparations such as powders and granules are difficult to mix evenly. It is better to make a stereotyped mixture. Therefore, for the mixed application of the active ingredients of the pesticide, the current mixed use and the mixture should be equal.
2) Whether the two pesticide preparations can be mixed in the books on the use of pesticides, the variety introduction should have the types of medicines that can be mixed or not mixed, and the matters needing attention when mixing. These materials should be consulted before the pesticides are mixed, so that the bamboo is in the chest.
3) Mixture of pesticides is popular in developed countries. A method of “tank mixing†is to produce a single agent that can be used for tank mixing, indicating the barrel mixing method. The mixed liquid is formulated by a motorized device or by manual dispensing or directly in the storage tank of the application dragging machine. Therefore, the preparations of foreign pesticide varieties include a single agent, a mixture, and a tank mixture. The tank mix can ensure the good physical properties of the mixed liquid, and can also mix the active ingredient groups that are not suitable for the mixture. China has now sold tank mixes, such as 50% acetochlor emulsifiable concentrate, 75% dry suspension, 38% atrazine suspension, 10% dry suspension.
4) When the pesticide is mixed, the method of dispensing the liquid is usually to prepare a single dose of the liquid with a sufficient amount of water, and then to dilute another single dose with the liquid; instead of mixing the two single agents, Dilute with water to avoid adverse reactions, including damage to active ingredients and deterioration of physical properties. In addition, the concentration of each active ingredient in the drug solution is calculated based on the total amount of the drug solution.
5) For the first time when the two single-agent experimental properties are mixed, a small amount of mixed liquid can be tested in a transparent glass container to see if there is oil slick, flocculation, accumulation or discoloration, heat generation, and production. Unusual scenes such as bubbles. Where the liquid shows a chemical change or a physical circulation of the liquid, the mixing is not desirable. If there is no problem in the mixing experiment, it is possible to carry out a small-area or single-crop plant phytotoxicity experiment with a mixture of liquid medicines, and the concentration of the liquid medicine can be higher than the actual concentration in the field. Initial observations ensure that no phytotoxicity will occur and that this compounding can be used in the field. In addition, China Pesticide Network believes that even with more mature experience, it is best to do preliminary experiments on the mixing of a single single agent before using it in large areas, because different manufacturers or the same manufacturer have the same product in different batches, quality. And the various ingredients contained may change.
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