Everyone should pay attention to the use of pesticides, especially the mixed use of pesticides, because whether it is to prevent the occurrence of pests and diseases, or to prevent the spread of pests and diseases are closely related to the use of pesticides!
Pesticide mixing sequence
The order of mixing pesticides and fertilizers 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, emulsifiable concentrate (in principle, pesticide mixing should not exceed Three), each one is added, stir well, then add the next one.
Add the water first and then add the medicine for a perfect second dilution. For example, when mixing, it is recommended to add half a bucket of water to the sprayer, add the first pesticide and mix; then, dilute the remaining pesticide with a plastic bottle, dilute it, pour it into the sprayer, and mix. And so on (if you want to work well, don't be lazy).
✔ 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
1. Mixing pesticides with different poisoning mechanisms
Different action mechanisms of pesticides 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
It can kill various pests in the field and kill the insects thoroughly, thus 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.
Precautions for mixing pesticides
1, do not change physical properties
Note that there should be no oil slick, flocculation, sedimentation or discoloration after mixing, and there should be no heat or bubbles.
If it is the same powder, granule, fumigant, or aerosol, it can be mixed; between different dosage forms, such as wettable powder, emulsifiable concentrate, thick emulsion, suspension, water solvent, etc. Should not be mixed.
2, does not cause chemical changes
✖ Many pharmaceuticals cannot be mixed with alkaline or acidic pesticides. For example, ether oxystrobin can not be mixed with substances such as strong alkali and strong acid pesticides; under alkaline conditions such as Bordeaux liquid and stone sulphur mixture, carbamate, pyrethroid insecticide, thiram and other dithio Carbamate fungicides are prone to hydrolysis or complex chemical changes that destroy the original structure.
✖ Under acidic conditions, 2,4-D sodium salt, sodium dimethyltetrachloride, and metformin will also decompose, thereby reducing the efficacy.
✖ In addition to acid and alkali, many pesticides cannot be mixed with drugs containing metal ions. For example, copper preparations should not be mixed with “metal†pesticides or foliar fertilizers (eg, mancozeb, sensitized zinc, fumarite, etc.).
The bismuth dithiocarbamate fungicide and the 2,4-D herbicide can be combined with the copper preparation to form a copper salt to reduce the efficacy.
Methyl thiophanate and thiophanate can be complexed with copper ions and lose their activity.
除去 Remove copper preparations, other preparations containing heavy metal ions such as iron, zinc, manganese, nickel, etc., should be used with caution.
The combination of vermiculite and Bordeaux mixture produces harmful copper sulfide and also increases the soluble copper ion content.
Earthworms, butachlor, azoxystrobin, etc. cannot 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.
After-school knowledge
Strong alkaline or alkaline pesticides: Bordeaux mixture, lime, amines, plant ash, stone sulphur mixture, rosin mixture, sodium pentachlorophenol.
A slightly acidic or slightly acidic pesticide: most organic phosphorus, as well as other commonly used fungal agents.
The above is the whole content of the principles and precautions related to the mixed use of pesticides brought by Xiaonong.com. The farmers who need it can refer to the study. It is necessary to know that if the compounding is unreasonable, it may be dangerous. However, it produces phytotoxicity. Especially emulsifiable concentrates, with thick-type medicinal agents and foliar fertilizers, these products have high density and very strong sedimentation, and they are poured into the bottom of the medicine pool, so sometimes there will be phytotoxicity and poor efficacy.
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