The rational mixing of pesticides can improve the control effect, delay the development of resistance to pests and diseases, improve the control effect, reduce the dosage, and prevent the use of pesticides for different pests and diseases to reduce the number of applications, thereby reducing labor costs. If the compounding is unreasonable, it can be dangerous. If the compounding is not effective, the drug will be harmful.
Pesticide mixing order
1 The order of pesticide mixing should be accurate. The order of foliar fertilizer and pesticides is usually: micro-fertilizer, water-soluble fertilizer, wettable powder, water-dispersible granules, suspending agent, microemulsion, water emulsion, water, and emulsifiable oil. (In principle, do not mix more than three kinds of pesticides), mix them thoroughly with each addition, and then add the next one.
2 After adding water and adding medicine, for the second dilution and mixing, it is recommended to add half a bucket of water to the sprayer, and then add the first pesticide and mix. Then, dilute the remaining pesticides with a plastic bottle, dilute them, pour them into the sprayer, mix them, and so on (if you want to work well, don't be lazy).
3 Regardless of the compounding agent, you should pay attention to “currently available, not suitable for a long timeâ€. Although the drug solution does not respond when it is just dispensed, it does not mean that it can be left for a long time, otherwise it will easily produce a slow reaction and gradually reduce the drug effect.
Principle of pesticide mixture
Mixture of pesticides with different poisoning mechanisms: Mixing pesticides with different action mechanisms can improve the control effect and delay the development of resistance to pests and diseases.
Pesticides with different poisoning effects: mixed insecticides have contact, stomach poisoning, fumigation, and internal absorption. The fungicides have protective, therapeutic, and systemic effects. If these drugs with different control effects are mixed, Replenishing each other will produce good control effects.
Insecticides that act on different insect states: Mixing insecticides that act on different insect states can kill various pests in the field and kill insects thoroughly, thereby improving the control effect.
Mixed use of pesticides with different aging: Some kinds of pesticides have good effect of quick-acting control, but the duration of effect is short; some quick-acting effects are poor, but the action time is long. The combination of such pesticides not only has good control effect after application, but also plays a long-term prevention and treatment role.
Mixed with synergist: Synergist has no direct poisoning effect on pests and diseases, but it can improve the control effect when mixed with pesticides.
Mixing pesticides for different pests and diseases: When several pests and diseases occur at the same time, this method can reduce the number of spraying and reduce working time, thus improving the efficiency.
Precautions for mixing pesticides
Although there are many advantages to mixing pesticides, it is forbidden to mix them at random. Unreasonable mixing is not only useless, but also has the opposite effect. Pay attention to the following points when mixing pesticides.
Does not change the physical properties: that is, after the mixing, there can be no oil slick, flocculation, sedimentation or discoloration, and no heat generation or bubble generation. If they are the same powder, or the same granules, fumigants, aerosols, generally can be mixed; between different dosage forms, such as wettable powder, emulsifiable concentrate, thick emulsion, suspension, water solvent, etc. The agent should not be mixed at will.
Does not cause chemical changes:
1 Including many agents can not be mixed with alkaline or acidic pesticides, under alkaline conditions such as Bordeaux mixture, stone sulfur mixture, carbamate, pyrethroid insecticide, thiram, dexame ring and other dithio amino groups Formic acid fungicides are prone to hydrolysis or complex chemical changes that destroy the original structure.
2 Under acidic conditions, 2,4-D sodium salt, 2 methyl 4-chloro sodium salt, and metformin will also be decomposed, thus reducing the drug effect.
3 In addition to acidity and alkalinity, many pesticide varieties cannot be mixed with drugs containing metal ions.
4 Dithiocarbamate fungicide, 2,4-D herbicide mixed with copper preparation can produce copper salt to reduce the efficacy.
5 Methyl thiophanate and thiophanate can be complexed with copper ions and lose their activity.
6 Remove copper preparations, other preparations containing heavy metal ions such as iron, zinc, manganese, nickel, etc., should be used with caution.
7 Stone sulphur mixture mixed with Bordeaux mixture can produce harmful copper sulphide and also increase the soluble copper ion content.
8 Enemy, butachlor and so on can not be mixed with organophosphorus and carbamate insecticides, and some chemical changes may cause phytotoxicity.
Pesticides with cross-resistance should not be mixed: such as fungicide carbendazim, methyl thiophanate has cross-resistance. Mixing not only does not delay the development of resistance to pathogens, but accelerates the development of drug resistance, so it cannot be mixed.
Biological pesticides cannot be mixed with fungicides: Many pesticide fungicides have a lethal effect on biological pesticides. Therefore, microbial pesticides and fungicides cannot be mixed.
More pesticide knowledge , please pay attention to China Pesticide Network
(Source: Agricultural Resources Guide)
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