First of all, it is the physical properties of compounded pesticides that do not change, that is, no oil, flocculation, sedimentation or discoloration can occur after mixing, nor can there be fever, bubbles, etc. 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. Second, the compound pesticides do not undergo chemical changes, so as to avoid phytotoxicity. Many agents cannot be mixed with alkaline or acidic pesticides. For example, in the case of basic conditions such as Bordeaux mixture and lime sulfur, carbamates, pyrethroid insecticides, thiram, dioscin, and other dithioamides. Formic acid bactericides are prone to hydrolysis or complex chemical changes, thereby destroying the original structure; under acidic conditions, 2,4-D sodium salt, 2A 4 sodium chloride salt, amitraz and so on will also decompose, thereby reducing the drug effect. In addition to acidity and alkalinity, many pesticide species cannot be mixed with metal ion-containing drugs. For example, dithiocarbamate fungicides, 2,4-D herbicides and copper preparations can produce copper salts to reduce the efficacy; Thiophanate-methyl and thiophanate-methyl 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, 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. Third, biopesticides cannot be mixed with fungicides. Under the premise of guaranteeing their normal functions, the following complementary effects should be considered as far as possible: compound insecticides, bactericides and even herbicides, simultaneous treatment of multiple pests and weeds, or use of fungicides with different bactericidal spectrums to expand prevention and control Object, 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. Injury; use a combination of quick-acting agents and agents with high efficacy but slow effects, such as pyrethroids or chlorpyrifos mixed with avermectins; and mixing agents with different mechanisms (without cross-resistance), which can be used to delay resistance. The increased potency of drugs has also increased the control effect and prolonged the effective period of the drug. Regardless of the combination of agents, the provisions of “current use, not long-term release†and “dilution and remixing†should be followed. It is best to conduct the test in a small area first.
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