Due to the frequent occurrence of various pests and diseases, most pesticides can only control one or a certain type of diseases and insect pests. Therefore, many farmers' friends hope to achieve the combined effect of treatment by using two or more medicaments at one time. Others hope to increase the use of mixed drugs. The effect of pharmaceutical control and quick-acting. The following three principles should be observed whether or not they are mixed:
The physical properties are not changed, that is, no oil, flocculation, precipitation or discoloration can occur after mixing, and no phenomenon such as fever or air bubbles can occur. If the same powder, or the same as granules, fumigants, aerosols, can generally be mixed; between different formulations, such as wettable powder, EC, emulsion, suspension, water solvent and other water-based media The agent should not be used arbitrarily.
Does not cause chemical changes, including many pesticides can not be mixed with alkaline or acidic pesticides, in Bordeaux mixture, lime sulfur and other alkaline conditions, carbamate, pyrethroid insecticides, Formosam, Daisen ring, etc. Dithiocarbamic bactericides are prone to hydrolysis or complex chemical changes that destroy the original structure. Under acidic conditions, 2,4-D sodium salt, 2A 4 sodium chloride salt, amitraz, etc. also decompose, thus reducing the efficacy. In addition to acidity and alkalinity, many pesticide species cannot be mixed with drugs containing metal ions. Dithiocarbamate fungicides, 2,4-D herbicides and copper preparations can produce copper salts to reduce the efficacy; thiophanate-methyl and thiophanate-methyl complexes 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, be careful when mixing. In addition, the mixture of lime sulfur and Bordeaux mixture can produce harmful copper sulfide, but also increase soluble copper ion content; propanil, butachlor and other can not be mixed with organic phosphorus, carbamate pesticides. Because some chemical changes may produce phytotoxicity.
Biopesticides cannot be mixed with fungicides. Under the premise of guaranteeing normal use of their original functions, consider the following complementary effects as much as possible:
Compound insecticides, bactericides, and even herbicides, as well as simultaneous treatment of a variety of pests and weeds, or mixed use of fungicides with different bactericidal spectrum, and expand the control objects to achieve the purpose of reducing the number of applications. This requires the selection of the right timing and medicament. For example, at the heading filling stage of wheat, mixed use of triadimefon, imidacloprid, and potassium dihydrogen phosphate can both aphid, powdery mildew, and rust, as well as promote the growth of wheat flag leaves, increase photosynthesis, prolong the growth period of wheat, and prevent dry hot wind. harm.
Use a combination of quick-acting agents and agents with high efficacy but slow effects, such as pyrethroids or chlorpyrifos mixed with avermectin; mix different agents with different mechanisms (no cross-resistance), which can delay the rise of drug resistance. The effect also increases control effectiveness and extends the pot life.
No matter what kind of pharmaceuticals are mixed, attention should be paid to the provisions of “Present the current use, not long-term release†and “Dilute and then mix separatelyâ€. It is best to test in a small area first.
The higher goal of blending is synergy, which requires rigorous scientific experimentation and analysis, and most of the results have been converted into complex formulations that can be purchased from stores. Any mixture should be limited to the extent that there is indeed a variety of pests and diseases and there is a single agent can not control the object or situation, do not arbitrarily expand the scope of application, can not consider the compound as a panacea. Symptomatic medication is still the most important.
Cosmetics are compound mixtures made from various raw materials after reasonable blending and processing. There are many types of cosmetics raw materials with different properties. According to the raw material properties and uses of cosmetics, it can be roughly divided into two categories: base raw materials and auxiliary raw materials. The former is a main raw material of cosmetics, which occupies a large proportion in cosmetic formulations, and is the main functional substance in cosmetics. The latter is responsible for shaping, stabilizing or imparting color, fragrance and other characteristics to cosmetics. These substances are not used in large amounts in cosmetic formulations, but are extremely important. Cosmetics are chemical mixtures made of natural, synthetic or extracted substances with different functions as raw materials and processed through production processes such as heating, stirring and emulsification.
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