To increase the effect of pest control, the mixing of pesticides has become the norm, and the mixing of pesticides is also conducive to reducing labor costs, but improper mixing methods will bring disastrous consequences. In the worst case, the efficacy of the pesticide will be reduced, and in the worst case, pesticide damage or even accidents will occur. Today we will talk about how to mix pesticides scientifically and reasonably.
Order of pesticide mixing
1. The order of pesticide mixing should be accurate
The order of mixing foliar fertilizers and pesticides is usually: micro-fertilizers, water-soluble fertilizers, wettable powders, water-dispersible granules, suspensions, microemulsions, water emulsions, water, and emulsifiable concentrates are added in sequence (in principle, no more than three types of pesticides should be mixed). Each time one is added, stir it thoroughly and mix it well, and then add the next one.
2. Add water first and then add medicine
When performing secondary dilution mixing, it is recommended to add half a bucket of water to the sprayer first, add the first pesticide and mix it well. Then, dilute the remaining pesticides with a plastic bottle, pour them into the sprayer after dilution, mix them well, and so on (if you want good efficacy, don't be lazy).
3. Mix and use now
No matter what pesticide you mix, you should pay attention to "mix and use now, and don't store for a long time". Although there is no reaction when it is just mixed, it does not mean that it can be stored for a long time at will, otherwise it is easy to produce slow reaction and gradually reduce the efficacy.
Principles of mixed pesticides
1. Mixed pesticides with different toxicity mechanisms
Mixing pesticides with different mechanisms of action can improve the prevention and control effect and delay the development of resistance in pests and diseases.
2. Mixed pesticides with different toxicity effects
Insecticides have contact, stomach poison, fumigation, systemic and other modes of action, and fungicides have protection, treatment, systemic and other modes of action. If these pesticides with different prevention and control effects are mixed, they can complement each other and produce good prevention and control effects.
3. Mixing insecticides that act on different insect stages
Mixed insecticides that act on different insect stages can kill various insect stages of pests in the field, kill insects thoroughly, and thus improve the control effect.
4. Mixed pesticides with different time effects
Some types of pesticides have good quick-acting control effects, but short-lasting effects; some types have poor quick-acting control effects, but long-lasting effects. Such mixed pesticides not only have good control effects after application, but also play a long-term control role.
5. Mixed with synergists
Although synergists have no direct toxic effect on pests and diseases, they can improve the control effect when mixed with pesticides.
6. Mixed pesticides that act on different pests and diseases
When several pests and diseases occur at the same time, this method can reduce the number of spraying and working time, thereby improving the efficacy.
Precautions for mixed pesticides
Although there are many benefits to mixing pesticides, avoid mixing them randomly. Unreasonable mixing is not only unhelpful, but also has the opposite effect. The following points should be noted when mixing pesticides:
1. No change in physical properties
That is, after mixing, there should be no floating oil, flocculation, precipitation or discoloration, and no heat or bubbles. If they are both powders, granules, fumigants, and aerosols, they can generally be mixed; different formulations, such as wettable powders, emulsifiable concentrates, concentrated emulsions, suspensions, and aqueous solvents, should not be mixed arbitrarily.
2. No chemical changes
① Many agents cannot be mixed with alkaline or acidic pesticides. Under alkaline conditions such as Bordeaux mixture and lime sulfur, carbamates, pyrethroid insecticides, and dithiocarbamic acid fungicides such as thiram and mancozeb are prone to hydrolysis or complex chemical changes, thereby destroying the original structure.
② Under acidic conditions, 2,4-D sodium salt, 2-methyl-4-chloro sodium salt, amitraz, etc. will also decompose, thereby reducing the efficacy.
③ In addition to acidity and alkalinity, many pesticide varieties cannot be mixed with drugs containing metal ions.
④ Dithiocarbamate fungicides, 2,4-D herbicides and copper preparations can generate copper salts to reduce the efficacy.
⑤ Methyl thiophanate and thiophanate can be complexed with copper ions and lose their activity.
⑥ In addition to copper preparations, other preparations containing heavy metal ions such as iron, zinc, manganese, nickel and other preparations should be mixed with caution.
⑦ Mixing lime sulfur with Bordeaux mixture can produce harmful copper sulfide and increase the content of soluble copper ions.
⑧ Dipyridamole, butachlor and other pesticides cannot be mixed with organophosphorus and carbamate insecticides. Some chemical changes may cause pesticide damage.
3. Pesticides with cross-resistance should not be mixed
For example, fungicides carbendazim and methyl thiophanate have cross-resistance. Mixing not only fails to delay the development of drug resistance in pathogens, but will accelerate the development of drug resistance, so they cannot be mixed.
4. Biological pesticides cannot be mixed with fungicides
Many pesticide fungicides are lethal to biological pesticides, so microbial pesticides and fungicides cannot be mixed.
Pesticide mixed formula sharing
1. Cyhalothrin + imidacloprid or acetamiprid can prevent green stink bugs.
2. Abamectin + 44% propylchlor, used on rice to control rice borers and rice stem borers, economical and affordable.
3. Emamectin benzoate + tebufenozide, can be used for noctuid pest control, with a long lasting effect.
4. Thiamethoxam and dinotefuran granules have become new ingredients for preventing small insects.
5. Dinotefuran + Cyhalothrin, highly effective and long-lasting control of whiteflies.
6. Cyhalothrin + Profenofos popular formula, special effect for underground pests.
7. Emamectin benzoate + triflumuron, control rice leaf rollers and fruit borers.
8. Emamectin benzoate·monosultap+isocarbophos, old formula: for various rice pests.
9. Abamectin + Chlorantraniliprole + Nitenpyram·Pymetrozine, a formula for all-purpose use on rice.
10. Nitenpyram·Pymetrozine + carbosulfan·Imidacloprid, good effect on peach tree resistant aphids.
11. Spirotetramat + Abamectin, very good effect on pear psyllids.
12. Omethoate + fenvalerate, good effect on wheat aphids and not expensive.
13. Prochloraz + Iprodione, great effect on leaf spot and anthracnose of leafy vegetables.
14. Organic copper preparation + benzylchloramine + iodine solution, economical and affordable for cucumber target spot disease.
15. Abamectin + Spirotetramat, absolutely no problem in controlling whiteflies, aphids, and thrips.
16. Emamectin benzoate + chlorfenapyr, double killing of insects and mites.
17. Buprofezin + spirotetramat, resist scale insects, safe and efficient.
18. Dimethomorph + polyantimony·manganese zinc, control water spinach white rust, melon downy mildew, three-day dry spot.
19. Emamectin benzoate·hexaflumuron + cyanuron, fight fruit tree borer, good effect.
20. Conventional agents for downy mildew and blight + organic copper preparations, the control effect is increased by more than 50%.
21. Flusilazole + organic copper, apply melon vine blight, good healing effect.
22. Methadone·Methadone/Methadone·Azoxystrobin + organic copper, control root diseases.
23. Shenqinmycin + well wax bud, treat melon vine blight and wilt.
24. Dapoxetine + thiamethoxam, fight flea beetles.
25. Abamectin + Cyromazine, fight leaf miners.
26. Oxyfluorfen + Pendimethalin, kill weeds in garlic fields, and eliminate both grass and broadleaf. The best combination.
27. Thiamethoxam + Bifenthrin, root irrigation to control groundworms and leek maggots.
28. Captan + Bacillus subtilis, solve the problem of continuous cropping.
29. Emamectin benzoate + tebufenozide, good effect in fighting beet and Spodoptera litura.
30. Hydrazoline + Methimoxadone/Methimoxadone·Methimoxadone, root irrigation to prevent root diseases.
31. Pyraclostrobin·Thiofuran, long-lasting effect in preventing citrus resin disease (sharp skin disease).
32. Abamectin + pyridabenzan/triazoctan + biphenyl well fat, treat highly resistant red and white spiders on fruit trees.
