Reasonable compounding of pesticides can improve the control effect, delay the development of insecticide resistance and reduce the dosage of pesticides. The combination of pesticides used to control different pests and insects can also reduce the number of application times, thereby reducing production costs.
If the mix is ​​not reasonable, it will reduce the efficacy, and even produce phytotoxicity.
1. Pesticide compounding order
(1) The order of compounding of pesticides and foliar fertilizers is usually: micronutrients, water-soluble fertilizers, wettable powders, water dispersible granules, suspending agents, microemulsions, water emulsions, water, and emulsifiable concentrates in order (in principle, pesticides are mixed Do not mix more than three), stir and mix thoroughly with each addition, then add the next one.
(2) Preparation sequence: Add water first and then add drugs. When two dilutions are mixed, it is advisable to add half a bucket of water to the sprayer and mix the first pesticide after mixing. Then, the remaining pesticide is diluted with a plastic bottle, diluted, poured into a sprayer, mixed, and so on.
(3) Pay attention to timeliness: "It is not used for a long time." Although the drug solution does not respond at the time of the dispensing, it does not mean that it can be stored for a long time. Otherwise, it will easily produce a slow reaction and gradually reduce the efficacy of the drug.
2, the principle of pesticide mixing
(1) Do not change physical properties
That is, no oil, flocculation, sedimentation, or discoloration can occur after mixing, and no phenomenon such as heat generation or bubble generation can occur. If the same powder, or the same as granules, fumigants, aerosols, can generally be mixed;
Between different dosage forms, such as wettable powders, emulsifiable concentrates, emulsions, suspensions, and water solvents, liquids that use water as the medium should not be used arbitrarily.
(2) Does not cause chemical changes
1 Many agents cannot be mixed with alkaline or acidic pesticides. Carbamates, pyrethroid insecticides, thiram, dioscin, etc. are used in alkaline conditions such as Bordeaux mixture and lime sulfur mixture. The bactericides are prone to hydrolysis or complex chemical changes that destroy the original structure.
2 Under acidic conditions, 2,4-D sodium salt, 2A 4 sodium chloride salt, amitraz, etc. will also decompose, thus reducing the efficacy.
3 In addition to acidity and alkalinity, many pesticides cannot be mixed with drugs containing metal ions.
4 Dithiocarbamate fungicides, 2,4-D herbicides and copper preparations can produce copper salts to reduce the efficacy.
5 Thiophanate-methyl and thiophanate-methyl can be complexed with copper ions and lose their activity.
6 Remove copper preparations. Other preparations containing metal ions, such as iron, zinc, manganese, and nickel, should be carefully used when mixing.
7 Lithosulphide mixed with Bordeaux mixture can produce harmful copper sulfide and also increase soluble copper ion content.
8 Propene, butachlor, etc. cannot be mixed with organic phosphorus and carbamate insecticides. Some chemical changes may cause phytotoxicity.
(3) Pesticides with cross-resistance should not be mixed
For example, the bactericide carbendazim and thiophanate-methyl have cross-resistance. Mixing can not only delay the growth of the bacteria, but also accelerate the development of drug resistance.
(4) Biopesticides cannot be mixed with fungicides
Many pesticide bactericides have a lethal effect on biological pesticides. Therefore, microbial pesticides and bactericides must not be mixed.
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