Attention: Pesticides mixed in this way, the efficacy of no!
Rational mixing of pesticides can improve the control effect, delay the emergence of pesticide resistance, improve the control effect, reduce the dosage of pesticides, and reduce the number of application of pesticides to control different pests and diseases, thus reducing labor costs. If the mixing is unreasonable, it will be dangerous, the light will have no effect, and the heavy will produce harm.
Pesticide mixing order
(1) The order of pesticide mixing should be accurate. The order of foliar fertilizer and pesticide mixing is usually micro-fertilizer, water-soluble fertilizer, wettable powder, water dispersible granule, suspension agent, micro-emulsion, water emulsion, water and emulsifiable oil (in principle, no more than three kinds of pesticide mixing). Every one is fully mixed, and then the next one is added.
When adding two times of water and adding medicine, it is recommended to add more than half of the pail of water in the sprayer and mix it with the first pesticide. Then, dilute the remaining pesticide with a plastic bottle, dilute it, pour it into the sprayer, mix it up, and so on.
(3) Whatever medicines are mixed, attention should be paid to the "ready-to-use, not long-term release". Although there is no reaction when the liquid is first prepared, it does not mean that it can be placed at will for a long time, otherwise it is easy to produce slow reaction and gradually reduce the efficacy of the medicine.
Principle of Pesticide Mixture
Mixed use of pesticides with different poisoning mechanisms: Mixed use of pesticides with different action mechanisms can improve the control effect and delay the emergence of pest resistance.
Pesticides with different toxic effects: Mixed pesticides have contact killing, stomach poisoning, fumigation, inhalation and other action modes, fungicides have protection, treatment, inhalation and other action modes. If these pesticides with different preventive and therapeutic effects are mixed, they can complement each other and produce good control effect.
Mixing insecticides in different insect states: Mixing insecticides in different insect states can kill all kinds of insect pests in the field and kill them thoroughly, so as to improve the control effect.
Mixed use of pesticides with different ageing: some kinds of pesticides have good quick-acting control effect, but short-lasting period; others have poor quick-acting control effect, but long-acting time. Such pesticides not only have good control effect after application, but also can play a long-term control role.
Mixed with synergist: Synergist has no direct toxicity to pests and diseases, but it can improve the control effect when mixed with pesticides.
Mixed pesticides for different pests and diseases: When several pests and diseases occur at the same time, this method can reduce the number of spraying, reduce the working time and improve the efficacy.
Points for Attention in Pesticide Mixture
Although pesticide mixing has many advantages, it should not be confused at will. It is not only useless to mix it unreasonably, but also has the opposite effect. The following points should be paid attention to when mixing pesticides.
Do not change physical properties
That is to say, oil slick, flocculation, precipitation or discoloration can not occur after mixing, nor can there be heating, bubbles and other phenomena. If they are powders, granules, fumigants and aerosols, they can be mixed.
Among different dosage forms, such as wettable powder, emulsifiable oil, concentrated emulsion, suspension agent, water-soluble agent and other liquid agents with water as medium should not be arbitrarily mixed.
Do not cause chemical changes
(1) Many pesticides can not be mixed with alkaline or acidic pesticides. Carbamate, pyrethroid insecticides, thiocarbamic acid fungicides such as formaldehyde and Daisen ring are liable to hydrolyze or undergo complex chemical changes under alkaline conditions such as Bordeaux liquid and stone sulfur mixture, thus destroying the original structure.
(2) Under acidic conditions, 2,4-D sodium salt, 2-methyl-4 sodium chloride salt and dimethylamidine can also be decomposed, thus reducing the efficacy.
(3) In addition to acidity and alkalinity, many pesticide varieties can not be mixed with drugs containing metal ions.
(4) Copper salt can be produced by mixing dithiocarbamate fungicides, 2,4-D herbicides and copper preparations to reduce the efficacy.
Thiophanate methyl and thiophanate can be complex with copper ions and lose their activity.
(5) In addition to copper preparations, other preparations containing heavy metal ions, such as iron, zinc, manganese and nickel, should be used with special caution.
The mixture of stone sulfur and Bordeaux liquid can produce harmful copper sulfide and increase the content of soluble copper ions.
_Dichlor barnyard, Butachlor and other insecticides can not be mixed with organic phosphorus, carbamate insecticides, some chemical changes may cause drug damage.
The pesticides with cross-resistance should not be mixed.
For example, fungicides Carbendazim and methyl tobrazine have cross-resistance. Mixed use can not delay the emergence of drug resistance, but can accelerate the emergence of drug resistance, so it can not be mixed.
Biopesticides should not be mixed with fungicides
Many pesticide fungicides are lethal to biological pesticides, so microbial pesticides and fungicides can not be mixed.