Good pesticide formula is very important

In the prevention and control of pests and diseases, a single dose gradually fades out of the historical stage, in order to increase the effect of prevention and treatment, the mixed use of pesticides has been promoted and applied.

Compounding purpose 1

1. Increase the spectrum of prevention and control. Each pesticide can control one or several harmful organisms. After compounding, it can expand the types of prevention and control and reduce the number of medications;

2, increase the effectiveness of prevention, some pesticides through scientific compounding, can provide control effect, is several times the single use, which can reduce the use of pesticides;

3, reduce resistance, a pesticide is prone to drug resistance when used for a long time, compounding can effectively alleviate the resistance of the product.

4, comprehensive prevention and control is most effective: for example, crops get sick, affirmation of the crop's own immunity is reduced, so the disease prevention and treatment should consider formula matching, such as treatment + nutrition at the same time, the effect is better.

5, high-efficiency, long-lasting prevention and control effect: generally the systemic use of a therapeutic fungicide and a protective fungicide. After being absorbed by the plant body, the systemic fungicide can be transported to various parts of the plant body to kill the bacteria in the plant. The protective fungicide remains on the surface of the plant to prevent the invasion of pathogens.

Pesticide mixing sequence 2

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 agent, emulsifiable concentrate. , in order (in principle, do not mix more than three kinds of pesticides), each one is mixed thoroughly, then add the next

2, first add water and then add medicine, when the second dilution mix, it is recommended to first add a large bucket of water in the sprayer, add the first pesticide and mix. Then, dilute the remaining pesticides with a plastic bottle, dilute them, pour them into the sprayer, mix them, and so on (if you want to work well, don't be lazy).

3, no matter what compound should be mixed, you should pay attention to "now available, 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.

Pesticide mixed principle 3

1. Mixing pesticides with different poisoning mechanisms

Mixing pesticides with different action mechanisms 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

The combination of insecticides acting on different insect states can kill various pests in the field and kill the insects thoroughly, thereby 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 pesticide mixing 4

Although there are many advantages to mixing pesticides, it is forbidden to mix them at random. Unreasonable mixing is not only useless, but also has the opposite effect. Pay attention to the following points when mixing pesticides.

1, do 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 the same powder, or the same granules, fumigants, aerosols, generally can be mixed;

2, between different dosage forms

For example, wettable powders, emulsifiable concentrates, concentrated emulsions, suspensions, water solvents, etc., which are water-based, should not be mixed.

3, 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, 2,4-D sodium salt, 2 methyl 4-chloro sodium salt, amitraz and the like are also decomposed, thereby reducing the drug effect.

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.

4. 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.

5, biological pesticides should not be mixed with fungicides

Many pesticide fungicides are lethal to biological pesticides. Therefore, microbial pesticides and fungicides cannot be mixed.

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