If pesticides are mixed in this way, they will have no effect at all! Nine effective ways to avoid drug damage are attached!

The reasonable mixed use of pesticides can improve the control effect, delay the resistance of diseases and pests, improve the control effect, reduce the dosage of pesticides, control the mixed use of pesticides of different diseases and pests, and reduce the frequency of application, thus reducing the labor cost.

If the mixture is unreasonable, it will be dangerous. If it is light, it will have no effect at all, and if it is serious, it will cause drug damage.

I. order of mixed use of pesticides

The mixing sequence of ① pesticides should be accurate, and the mixing order of foliar fertilizers and pesticides is usually as follows: micro-fertilizer, water-soluble fertilizer, wettable powder, water dispersible granule, suspending agent, microemulsion, water emulsion, EC (in principle, no more than three kinds of pesticides are mixed), and then the next one is added.

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

③ should pay attention to "present use, not long-term use" no matter what kind of medicament is mixed. Although the liquid does not react when it is just prepared, it does not mean that it can be kept at will for a long time, otherwise it is easy to produce a slow reaction and gradually reduce the efficacy.

II. Principle of mixed use of pesticides

The mixed use of pesticides with different toxic mechanisms in ●: the mixed use of pesticides with different mechanisms can improve the control effect and delay the resistance of diseases and pests.

Pesticides with different toxic effects of ●: mixed insecticides have contact, stomach poison, fumigation, internal inhalation and other functions, while fungicides have protective, therapeutic, internal inhalation and other functions. If these pesticides with different control effects are mixed, they can complement each other and produce good control effects.

● acts on the mixed use of insecticides of different insect states: the mixed use of insecticides acting on different insect states can kill all kinds of insect pests in the field thoroughly, so as to improve the control effect.

● has mixed use of pesticides with different ages: some kinds of pesticides have good quick-effect control effect, but the duration is short; some quick-effect control effect is poor, but the action time is long. The mixed use of such pesticides can not only have a good control effect after application, but also play a role in long-term control.

The mixed use of ● and synergist: although the synergist has no direct toxic effect on diseases and insect pests, it can improve the control effect when mixed with pesticides.

● acts on the mixed use of pesticides of different diseases and insect pests: when several diseases and insect pests occur at the same time, this method can reduce the number of spraying, reduce the working time, and improve the efficiency.

Matters needing attention in the mixed use of pesticides

Although the mixed use of pesticides has many advantages, do not mix it at will. Unreasonable mixing is not only useless, but also has the opposite effect. The mixed use of pesticides should pay attention to the following points.

● does not change physical properties.

That is, after mixing, there can be no oil slick, flocculation, precipitation or discoloration, nor can there be heat, bubbles and other phenomena. If they are both powders, or granules, fumigants or fumigants, they can generally be mixed.

Different dosage forms, such as wettable powder, EC, concentrated emulsion, gel suspension, water solvent and so on, should not be mixed arbitrarily.

● does not cause chemical change.

① includes many agents that can not be mixed with alkaline or acidic pesticides. Under alkaline conditions such as Bordeaux solution and stone-sulfur mixture, carbamate, pyrethroid insecticides, dithiocarbamate fungicides such as thiram and Dysencycline are prone to hydrolysis or complex chemical changes, thus destroying the original structure.

Under acidic conditions, ② also decomposed, such as 2mae 4m D sodium salt, 2methyl 4 chloride sodium salt, diformamidine, etc., thus reducing the efficacy.

Except for acidity and basicity, many kinds of pesticides can not be mixed with drugs containing metal ions.

The mixture of ④ dithiocarbamate fungicides, 2mai 4mer class D herbicides and copper preparations can produce copper salts to reduce the efficacy.

⑤ thiophanate methyl and thiophanate can chelate with copper ion and lose their activity.

⑥ removes copper preparations and other preparations containing heavy metal ions, such as iron, zinc, manganese, nickel, etc., should be used with special caution.

The mixture of ⑦ stone sulfur mixture and Bordeaux solution can produce harmful copper sulfide and increase the content of soluble copper ions.

Pesticides with cross-resistance of ● should not be mixed.

For example, fungicides carbendazim and methyl topiramate have cross-resistance. Mixed use not only can not delay the emergence of drug resistance, but will accelerate the emergence of drug resistance, so it can not be mixed.

● Biopesticide cannot be mixed with Fungicides

Many pesticide fungicides are lethal to biological pesticides, so microbial pesticides and fungicides can not be mixed.

Four and nine effective methods to avoid drug damage

1. Read the instructions affixed to the medicine bottle before spraying.

To understand the properties of this pesticide and the object of disease and pest control. At present, most of the pesticides sold in the market are mixed. That is, organophosphorus pesticides are mixed with pyrethroid pesticides, or mixed with biological pesticides, or mixed with insecticides and acaricides and diesel oil (engine oil). Some of the same pesticide varieties have different trade names due to different production plants, and so on.

2. Avoid mixing many kinds of pesticides

A disease or pest should be controlled by using one pesticide as far as possible to avoid the mixing of many pesticides. When there are two kinds of diseases and insect pests, pesticide spraying can be selected to treat both diseases and insect pests. Because in a certain amount of water, the more kinds of pesticides are added, the higher the concentration will be, and the greater the possibility of drug damage will be. And there may be the same variety of pesticides.

3. Do not increase the spraying concentration of pesticides at will.

4. Avoid spraying pesticides at noon in the hot sun

Spray EC damage in high temperature weather

5. Pay attention to the use of oily and alkaline pesticides

Spraying pesticides containing oils (diesel oil, engine oil) or pesticides with strong alkalinity (Bordeaux liquid, stone sulfur mixture, turpentine mixture, etc.) should pay close attention to the weather, temperature, season and the phenological phase of citrus trees. For example: after the first physiological fruit drop period, try not to spray oil emulsion pesticides, so as not to increase the number of fruit drop, citrus trees do not spray Bordeaux immediately when they are wet in cloudy and rainy days.

6. the use of insoluble water agents and growth regulators

Some insoluble pesticides should first add a small amount of water to form a mother liquid, and then dilute the spray. When spraying growth regulators, some varieties need to be dissolved with alcohol first.

7. Use clean water as spray water

Clean water should be used for spraying, and pesticides should not be diluted with sewage or well water.

8. Exchange and use

After some pesticides are mixed, they should be sprayed in time and should not be left for use the next day. Pesticides that cannot be mixed should not be forcibly added.

Pay attention to the use of herbicides

When spraying herbicides, we must select varieties that have no effect on the roots of citrus trees, and avoid spraying spray on the branches and leaves of citrus trees. It is recommended to use glyphosate for orchard weeding to reduce the use of glyphosate.