The mixing of pesticides and pesticides is a more complicated problem. Not all pesticides can be mixed. The following points should be paid attention to during mixing:
1. The pH is an important factor affecting the effectiveness of each component. Under alkaline conditions, carbamates, pyrethroid insecticides, thiram, daisen ring and other 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 decompose, thus reducing the efficacy of the drug.
2. Organosulfur and organophosphorus pesticides cannot be mixed with copper-containing pesticides, such as dithiocarbamate fungicides, 2,4-D salt herbicides and copper preparations, because they are complexed with copper ions , And lose activity.
3. Microbial insecticides and systemic organophosphorus insecticides cannot be mixed with fungicides.
4. For mixed use of emulsifiable concentrates or wettable powders, no delamination, oil slick, sedimentation, etc. are required.
5. It is necessary to avoid phytotoxicity of the mixture. The chemical changes of the active ingredients in the composition of the mixture may cause phytotoxicity. For example, the mixture of lime sulphur mixture and Bordeaux mixture can produce harmful copper sulfide and increase the content of soluble copper ions; Grass amine, etc. cannot be mixed with organophosphorus and carbamate insecticides.
6. Insecticides, fungicides and herbicides are mixed with fewer varieties.
7. There are many varieties of fungicide mixtures, mainly including seed dressing double, metalaxyl mancozeb, polysulfide gum suspension, and Tuijunte.
8. There are few mixed varieties of plant growth regulators. Such as mixed use of gibberellin and chlormequat, mixed use of gibberellin and naphthalene acetic acid and so on.
Post time: Mar-25-2021