Pesticide mixing mainly refers to the preparation of two liquid pesticide formulations together and becomes a liquid spray. Reasonable mixture of pesticides can expand the scope of use or treat several harmful organisms, which can improve work efficiency; some mixed use 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 problems when mixing pesticides:
1. The chemical stability of each active ingredient will affect the stability of the active ingredients. Common organic phosphates, carbamates, pyrethroid insecticides, the active ingredients are all "esters", generally alkaline More sensitive, it will hydrolyze in alkaline media. Dithiocarbamate fungicides such as thiram and daisen ring, the active ingredients are destroyed by complex chemical changes in an alkaline medium. Although some pesticides are relatively stable under weak alkaline conditions, they should be used immediately after being formulated into a weakly alkaline liquid. It should not be placed for too long. Therefore, mixing with alkaline drugs must be cautious. Common alkaline fertilizers such as ammonia, ammonium bicarbonate, precipitated calcium phosphate, etc. 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 cubic configuration of beta-cypermethrin and lambda-cyhalothrin (fungimethrin) is stable only in a narrow ph range, the medium is acidic and easy to decompose, and the medium is "allocated". Reduce the efficacy. In addition to acid and alkali, many pesticide varieties cannot be mixed with metal ion-containing drugs. The dithiocarbamate fungicide, the 2,4-salt herbicide and the copper formulation can be complexed with copper ions to lose activity. Remove copper preparations, other preparations containing heavy metal ions such as iron, zinc, manganese, nickel, etc., should be especially careful when mixing.
2, to ensure good physical properties of the drug solution
The emulsifiable concentrate should have good emulsifying properties after water. The two kinds of emulsifiable liquids are also required to have good emulsifying properties, and there is no emulsification or even delamination, oil slick, precipitation and the like. The medicinal liquid mixed with the wettable powder also requires good suspension properties and cannot reproduce flocculation and precipitation. Any physical property of the liquid after compounding can be obviously deteriorated, so as not to reduce the effect, invalidate or even cause phytotoxicity. When the pesticide emulsifiable concentrate or the wettable powder is processed and produced, only the chemical liquid having good physical properties of the preparation is considered. It is impossible, and practically, the physical properties of the chemical liquid after the preparation is mixed with any other preparations.
3, to ensure that side effects such as phytotoxicity are avoided. Chemical changes in active ingredients may cause phytotoxic substances. The combination of stone sulphur and Bordeaux mixture produces harmful copper sulphide, which also increases 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 oil slick, it will definitely cause phytotoxicity. The enemy is used to control alfalfa in rice fields, because an amidase in rice plants can decompose the active constituents of the enemy. 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.
Mixed pesticides should also pay attention to:
1. The existing mixed use of pesticides can be flexibly applied according to the occurrence of crop pests and the control requirements. This is a basic technical requirement for the use of pesticides. However, the frequent or widespread mixing of pesticides is often made into a mixture when the pesticide is processed. In general, the mixture of active ingredients is more scientific and reasonable, and the physical and chemical properties of the preparation should be better than those for reproducible mixing. Some solid preparations such as powders and granules are difficult to mix evenly, and 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 precautions when mixing. You should check these materials before mixing pesticides.
3. Mixed use of pesticides In developed countries, a “bucket-mixing†measure is popular, that is, the pesticide preparation processing plant produces a single agent that can be used for tank mixing, indicating the barrel mixing method, and the barrel mixing preparations that match each other in the application are dispensed in the field. The site is compounded with a motorized device or a mobile drug or directly in a drug storage tank of the application tractor. 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 mixture, and can also be used to mix the active ingredients that are not suitable for the mixture. China has now sold tank mixes, such as 50% acetochlor EC + Bao 75% + dry suspension, 38% atrazine suspension + Bao 75% dry suspension.
4. When the pesticide is mixed, the method of dispensing the liquid is generally 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 first, Dilute with water to avoid adverse reactions, including destruction of 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. When mixing the two single-agent test properties for the first time, first test a small amount of mixed liquid in a transparent glass container to observe whether there is oil slick, flocculation, sedimentation or discoloration, heat generation. Abnormal phenomena such as bubbles. Where the liquid shows a chemical change or a physical circulation of the liquid, this compounding is not desirable. If there is no problem in the compounding test, a small mixed liquid can be used to carry out the phytotoxicity test of a small area or a single crop, and the concentration of the liquid is higher. Preliminary observations will ensure that there will be phytotoxicity. In addition, even if there is more mature experience, it is best to do a preliminary test for the mixing of two single agents before large-area application, because different people or different batches of the same manufacturer The same product, quality and various ingredients may change.
Pay attention to the following problems when mixing pesticides:
1. The chemical stability of each active ingredient will affect the stability of the active ingredients. Common organic phosphates, carbamates, pyrethroid insecticides, the active ingredients are all "esters", generally alkaline More sensitive, it will hydrolyze in alkaline media. Dithiocarbamate fungicides such as thiram and daisen ring, the active ingredients are destroyed by complex chemical changes in an alkaline medium. Although some pesticides are relatively stable under weak alkaline conditions, they should be used immediately after being formulated into a weakly alkaline liquid. It should not be placed for too long. Therefore, mixing with alkaline drugs must be cautious. Common alkaline fertilizers such as ammonia, ammonium bicarbonate, precipitated calcium phosphate, etc. 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 cubic configuration of beta-cypermethrin and lambda-cyhalothrin (fungimethrin) is stable only in a narrow ph range, the medium is acidic and easy to decompose, and the medium is "allocated". Reduce the efficacy. In addition to acid and alkali, many pesticide varieties cannot be mixed with metal ion-containing drugs. The dithiocarbamate fungicide, the 2,4-salt herbicide and the copper formulation can be complexed with copper ions to lose activity. Remove copper preparations, other preparations containing heavy metal ions such as iron, zinc, manganese, nickel, etc., should be especially careful when mixing.
2, to ensure good physical properties of the drug solution
The emulsifiable concentrate should have good emulsifying properties after water. The two kinds of emulsifiable liquids are also required to have good emulsifying properties, and there is no emulsification or even delamination, oil slick, precipitation and the like. The medicinal liquid mixed with the wettable powder also requires good suspension properties and cannot reproduce flocculation and precipitation. Any physical property of the liquid after compounding can be obviously deteriorated, so as not to reduce the effect, invalidate or even cause phytotoxicity. When the pesticide emulsifiable concentrate or the wettable powder is processed and produced, only the chemical liquid having good physical properties of the preparation is considered. It is impossible, and practically, the physical properties of the chemical liquid after the preparation is mixed with any other preparations.
3, to ensure that side effects such as phytotoxicity are avoided. Chemical changes in active ingredients may cause phytotoxic substances. The combination of stone sulphur and Bordeaux mixture produces harmful copper sulphide, which also increases 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 oil slick, it will definitely cause phytotoxicity. The enemy is used to control alfalfa in rice fields, because an amidase in rice plants can decompose the active constituents of the enemy. 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.
Mixed pesticides should also pay attention to:
1. The existing mixed use of pesticides can be flexibly applied according to the occurrence of crop pests and the control requirements. This is a basic technical requirement for the use of pesticides. However, the frequent or widespread mixing of pesticides is often made into a mixture when the pesticide is processed. In general, the mixture of active ingredients is more scientific and reasonable, and the physical and chemical properties of the preparation should be better than those for reproducible mixing. Some solid preparations such as powders and granules are difficult to mix evenly, and 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 precautions when mixing. You should check these materials before mixing pesticides.
3. Mixed use of pesticides In developed countries, a “bucket-mixing†measure is popular, that is, the pesticide preparation processing plant produces a single agent that can be used for tank mixing, indicating the barrel mixing method, and the barrel mixing preparations that match each other in the application are dispensed in the field. The site is compounded with a motorized device or a mobile drug or directly in a drug storage tank of the application tractor. 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 mixture, and can also be used to mix the active ingredients that are not suitable for the mixture. China has now sold tank mixes, such as 50% acetochlor EC + Bao 75% + dry suspension, 38% atrazine suspension + Bao 75% dry suspension.
4. When the pesticide is mixed, the method of dispensing the liquid is generally 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 first, Dilute with water to avoid adverse reactions, including destruction of 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. When mixing the two single-agent test properties for the first time, first test a small amount of mixed liquid in a transparent glass container to observe whether there is oil slick, flocculation, sedimentation or discoloration, heat generation. Abnormal phenomena such as bubbles. Where the liquid shows a chemical change or a physical circulation of the liquid, this compounding is not desirable. If there is no problem in the compounding test, a small mixed liquid can be used to carry out the phytotoxicity test of a small area or a single crop, and the concentration of the liquid is higher. Preliminary observations will ensure that there will be phytotoxicity. In addition, even if there is more mature experience, it is best to do a preliminary test for the mixing of two single agents before large-area application, because different people or different batches of the same manufacturer The same product, quality and various ingredients may change.
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