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.
First, the pesticide mix 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. Add (in principle, do not mix more than three pesticides), mix well with each addition, then add the next one.
2, first add water and then add medicine, when the second dilution mix, it is recommended to first add a large bucket of water in the sprayer, 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, no matter what compound should be mixed, you should pay attention to "now available, not suitable for a long time." 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.
Second, the principle of pesticide mixing
1. Mixing 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.
2. Mixing pesticides with different poisoning effects
Insecticides have contact, stomach, fumigation, and internal absorption. The fungicides have protective, therapeutic, and systemic effects. If these drugs with different control effects are mixed, they can complement each other and produce good results. Control effect.
3. Mixing insecticides that act on different insect states
The combination of insecticides acting on different insect states can kill various pests in the field and kill the insects thoroughly, thereby improving the control effect.
4. Mixtures 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.
5, mixed with synergists
Synergists have no direct toxicity to pests and diseases, but they can improve the control effect when mixed with pesticides.
6. 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 the working time, thereby improving the efficiency.
Third, the precautions for the mixed use of 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.
1, do not change physical properties
That is to say, after mixing, there is no occurrence of oil slick, flocculation, sedimentation or discoloration, and no occurrence of heat generation or bubble generation. If the same powder, or the same granules, fumigants, aerosols, generally can be mixed;
Between different dosage forms, such as wettable powder, emulsifiable concentrate, concentrated emulsion, suspension, water solvent and the like, the liquid agent is not suitable for mixing.
2, does not cause chemical changes
1 includes 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, 24-D sodium salt, 2 methyl 4-chloro sodium salt, amitraz and the like will also be decomposed, thus reducing the drug effect.
3 In addition to acid and alkali, many pesticide varieties cannot be mixed with drugs containing metal ions.
4 dithiocarbamate fungicides, 24-D herbicides mixed with copper formulations can produce copper salts to reduce the efficacy.
5 thiophanate-methyl 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.
The combination of 7 stone sulphur and Bordeaux mixture can produce harmful copper sulphide and also increase the soluble copper ion content.
8 Enemy, butachlor and the like can not be mixed with organophosphorus and carbamate insecticides, and some chemical changes may cause phytotoxicity.
3. Pesticides with cross-resistance should not be mixed
For example, the fungicide carbendazim and methyl thiophanate have 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.
4. Biological pesticides cannot be mixed with fungicides.
Many pesticide fungicides are lethal to biological pesticides. Therefore, microbial pesticides and fungicides cannot be mixed.
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