What a change it after regular use of pesticides complex technology, compounded with pesticides on pesticide application? There are physical and chemical changes in pesticide compounding:
Physical change
Pesticide compounding should first notice whether physical properties have changed. It is well known that various formulations of pesticides have certain physical properties, such as fineness and dispersibility of powders, emulsifying properties of emulsions, and performance of dispersion properties. These properties are essential to give full play to the control effect.
Physical changes after compounding and mixing pesticides
(1) After the pesticide compounding and mixing, the physical properties are basically not changed, and the physical properties of the original preparation are maintained. Therefore, the control effect is not affected by the change of physical properties, and no phytotoxicity occurs. Such a preparation is visually considered to be compounded and mixed.
(2) After the pesticide is compounded, the physical properties of the preparation are improved, and the control effect of the medicament is improved. Emulsifiable oils such as chlorpyrifos and chlorpyrifos are not prone to crystallization and have good emulsifying properties, thereby improving the efficacy.
2. Chemical changes
Various pesticides have certain chemical properties, which are closely related to their biological activities. Therefore, when the pesticide is compounded and mixed, if its chemical properties are unchanged, no adverse effects will occur. However, when pesticides with different chemical properties are compounded and mixed, some may undergo chemical changes. According to its effect on living things, chemical changes can be divided into beneficial and harmful two kinds, it is beneficial to improve the control effect of the drug, reduce the toxicity to warm-blooded animals, reduce the chemical damage or increase the chemical changes of some other beneficial properties. However, this situation is a minority, most of which reduce the efficacy of the drug, increase toxicity and phytotoxicity.
There are several chemical changes that often occur between pesticides:
(1) Hydrolysis Some alkaline pesticides such as Bordeaux mixture, stone sulphur mixture, etc. and organophosphorus pesticides such as fenthion, parathion, chlorpyrifos and the likes of carbazides and carbaryl It is easy to hydrolyze organophosphorus and carbamate pesticides and thus quickly fail.
(2) Dehydrochlorination Many organochlorine pesticides are easily dehydrochlorinated when mixed with alkaline pesticides, such as trichlorfon, dichlorvos, dicofol, etc., and thus fail.
(3) Metal replacement reaction Dithiocarbamate such as metal ions in the fungicides such as zinc or mancozeb, and metals in copper preparations are prone to substitution, the former forms poorly soluble copper salts, and reduces chemical control. The latter effect is due to the substitution of zinc, manganese, etc. to increase the solubility, and it is easy to cause a rash damage to the skin.
(4) Other chemical reaction stone sulphur mixture is mixed with a copper preparation such as Bordeaux mixture, and vulcanization is reflected, and copper sulfide which is toxic is easily formed. Systemic fungicides such as carbendazim, thiophanate, tricyclazole, etc. have certain stability and are suitable for mixing with many protective fungicides. Phenoxyacetic acid herbicides such as 2, 4 drops, 2 methyl 4 chlorine, etc., are generally relatively stable in chemical properties, and can be mixed with a metal-containing agent to form a salt, but generally do not significantly reduce the efficacy, in herbicides . There are few agents containing metal elements, so the compounding range is also wide.
The nature of phytochemicals is complex, and generally does not have much chemistry when compounded with organically synthesized agents, and has little effect on the effects of the medicinal agents.
In the compounding and mixing of various types of pesticides, the chemical reaction is most likely to occur, and the effect of the drug is reduced. Among inorganic pesticides, alkaline pesticides and metal-containing pesticides are the most common, and they are most likely to cause decomposition or failure of other pesticides in compounding and mixing, or cause phytotoxicity.
In summary, when pesticides are mixed, physical or chemical changes sometimes occur. Some of these changes will improve the control effect, while others will reduce the effect and even cause phytotoxicity. Some of these changes can be judged from their physical and chemical properties, some are not easy to judge, and the physiological effects on living organisms are very complicated. Therefore, it is difficult to determine the compound after compounding from the physical and chemical properties of the chemicals. Qu activity. Therefore, whether two or several pesticides are suitable for compounding and mixing must be confirmed by experiments.
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