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How to mix pesticides and choose compound agents

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How to mix pesticides and choose compound agents

pubdate:2019-12-18 00:00 source:http://www.mazaland.com Click:

Since many kinds of pests and diseases often occur, and most of the pesticides can only control one or a certain type of pests, many farmers hope to achieve the effect of simultaneous treatment by mixing two or more pesticides at a time; others hope to improve The effectiveness and quick-acting of chemical control. Regardless of whether it is mixed or not, the following three principles should be noted: cyanuric chloride


does not change the physical properties, that is, no oil slick, flocculation, precipitation or discoloration, heat generation, bubbles, etc. should not appear after mixing. If the same powder, or the same granule, fumigant, aerosol, generally can be mixed; between different dosage forms, such as wettable powder, emulsifiable concentrate, emulsion, suspension, water solvent and other liquids with water as the medium Agents should not be mixed arbitrarily.


Does not cause chemical changes, including many agents that cannot be mixed with alkaline or acid pesticides. Under alkaline conditions such as Bordeaux mixture and lime sulfur mixture, carbamates, pyrethroid insecticides, thiram, daisen ring, etc. Dithiocarbamic acid fungicides are prone to hydrolysis or complex chemical changes, thereby destroying the original structure. Under acidic conditions, 2,4-D sodium salt, 2-methyl-4 chloride sodium salt, bisformamidine, etc. will also decompose, thereby reducing the efficacy of the drug. In addition to acidity and alkalinity, many pesticides cannot be mixed with drugs containing metal ions. Dithiocarbamate fungicides, 2,4-D herbicides and copper preparations can be mixed to produce copper salts to reduce the efficacy; thiophanate-methyl and thiophanate can be complexed with copper ions and lose their activity. Remove copper preparations, other preparations containing heavy metal ions, such as iron, zinc, manganese, nickel and other preparations, should be particularly cautious when mixing. In addition, the mixing of lime sulfur mixture with Bordeaux mixture can produce harmful copper sulfide and increase the content of soluble copper ions; propanyl, butachlor, etc. cannot be mixed with organophosphorus and carbamate pesticides. Because some chemical changes may cause phytotoxicity.

 

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Biological pesticides cannot be mixed with fungicides. On the premise of ensuring the normal play of their original roles, the following complementary effects should be considered as much as possible:


Compound insecticides, bactericides and even herbicides can simultaneously treat multiple diseases, insects and weeds that occur at the same time, or mix fungicides with different bactericidal spectrums to expand the target of control and reduce the number of applications. This requires choosing the right timing and medicine. For example, during the heading and filling stage of wheat, the mixed use of triadimefon, imidacloprid and potassium dihydrogen phosphate can not only cure aphids, powdery mildew and rust, but also promote the growth of wheat flag leaves, increase photosynthesis, extend the growth period of wheat, and prevent dry and hot wind. harm.


Mixing quick-acting agents with high-efficiency but slow-acting agents, such as pyrethroid or chlorpyrifos and abamectin; mixing agents with different mechanisms of action (no cross-resistance) can delay the increase in resistance The role of the drug also improves the control effect and prolongs the effective period of the drug.


Regardless of what kind of medicine is mixed, you should pay attention to the regulations of "preparing for current use, not for long time" and "dilute separately and then mix". It is best to test on a small scale first.


The higher goal of blending is synergy, which requires rigorous scientific experiments and analysis. Most of the results have been converted into compound preparations, which can be purchased from stores. Any mixture should be limited as far as possible when a variety of pests and diseases do occur, and objects or situations that cannot be controlled by a single agent occur. Do not arbitrarily expand the scope of application, and do not treat the compound as a panacea. Symptomatic medication is the most important thing.


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