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. Add (in principle, do not mix more than three pesticides), mix well with each addition, 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, the remaining pesticide is diluted with a plastic bottle, diluted, poured into a sprayer, mixed, and so on.
3. Regardless of the compounding agent, you should pay attention to "the current distribution is 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.
Pay attention to the following points when mixing pesticides :
Does 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 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 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, 2,4D sodium salt, amitraz and the like will also be decomposed, thus reducing the efficacy. 3 In addition to acid and alkali, many pesticide varieties cannot be mixed with drugs containing metal ions. 4 dithiocarbamate fungicides, 2,4-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.
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.
More pesticide knowledge , please pay attention to China Pesticide Network
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