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. 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. Again, 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. 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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First of all, the physical properties of the compound pesticides do not change. No oil, flocculation, sedimentation or discoloration can occur after mixing, nor can there be fever, air bubbles, etc. If the same powder, or the same granules, fumigants, aerosols, can generally be mixed; between different formulations Such as wettable powders, emulsifiable concentrates, emulsions, slurries, water solvents, etc. as the liquid medium for the medium should not be mixed.