Chemical changes When pesticides are mixed, adverse chemical reactions should be avoided as much as possible. Different pesticides have different chemical properties. Therefore, it is necessary to understand the possible chemical changes of various pesticides and to consider the compounding of pesticides. Most organophosphorus pesticides are acidic, unstable under alkaline conditions, easily decomposed to produce biologically inactive substances, and lose control effectiveness. For example, parathion methyl parathion, triterpenoids, malathion, dimethoate and other insecticides such as rice bran and other rice bran are not mixed with alkaline pesticides. In contrast, octamethylphosphonium is stable in alkaline media and is easily decomposed in acidic media. Carbamate pesticides and organic phosphorus pesticides, the case of alkali decomposition is easy to failure, and should not mix and mix with alkaline pesticides. In organosulfur fungicides, dithiocarbamate derivatives such as zesin zinc, thiram, and thiram, etc., although they have a certain degree of stability, they also decompose under alkaline conditions and are not suitable for alkaline pesticides. Mixed use. Chlordecane, a bactericide containing trichloromethane, and sterilized Dan, although strongly alkaline, can cause complex chemical changes, but it is usually relatively stable. Therefore, their compounding range is relatively wide, especially in the amount of mixed substances containing captan. The systemic fungicide such as carbendazim, thiophanate-methyl, tricyclazole, etc., has a certain degree of stability and is suitable for mixing with many protective fungicides. The chemical properties of phenoxyacetic herbicides such as 2,4-D are generally stable and can be generated when mixed with agents containing metal elements. However, in general, the efficacy of the herbicide is not significantly reduced, and the herbicide contains few metal elements. Therefore, the compounding range thereof is also relatively wide. The nature of plant pesticides is relatively complex, and generally does not have much chemical effect when mixed with organic synthesis agents. It has little effect on the efficacy of pesticides. Among various types of pesticides used for compounding, inorganic pesticides are most likely to cause chemical reactions, reduce efficacy, and cause phytotoxicity. Among inorganic pesticides, the most common pesticides are alkaline pesticides and metal-containing pesticides. They are most likely to decompose other pesticides or cause phytotoxicity in compounding and mixing applications. Therefore, whether two or more pesticides are suitable for compounding must be confirmed by tests. Physical changes pesticides should first notice whether the physical properties change. There are three situations in which the physical changes after pesticide compounding are nothing more than three. 1 After the pesticides were mixed and mixed, the physical properties did not change substantially, and the physical injection energy of the original preparations was maintained. Therefore, it will not affect the control effect, nor does it cause phytotoxicity. Such a preparation can be considered for rehabilitation. 2 After the pesticide was reconstituted, the physical properties of the preparation were improved, and the control effect of the pharmaceutical was improved. For example, emulsifiable concentrates such as propanil and chrysanthemum are not easily crystallized, and their emulsifying properties are good, thereby improving their efficacy. 3 Poor physical changes occurred after compounding of pesticides, such as demulsification of emulsifiable concentrates; poor dispersibility of various preparations; decreased suspensibility of wettable powders, such as flocculation or sedimentation, so that the pharmaceuticals lost their good physical properties and reduced their effectiveness. Effectiveness may even cause phytotoxicity. Addition and addition of two or more pesticides together with synergistic effects may enhance the effects of organisms (including control subjects, protected subjects, humans and animals, etc.). 1 The virulence of compounded and mixed pesticides for the same organism and the sum of the virulence of the various agents that make up the mixture are equal to additive and additive. For example, the antagonistic black-tailed leafhopper is a typical example. In general, pesticides with similar chemical structures and the same mechanism of action are compounded together, and most of them show additive effects. Due to the differences in fast-acting properties, residual activity, ovicidal activity, biological activity spectrum, and price, some virulence compounds are compounded together. Although the virulence test results show an additive effect, they can be used to complement each other. Practical value. (2) Synergism or venom enhancement The virulence of a mixed agent on the same organism is greater than the sum of the virulence of the individual agents that make up the mixture, and the combined effect is a synergistic effect. Change from the change. For example, phenathion, rice bran, etc. have a very high inhibitory effect on the carboxylate esters that decompose malathion, so that its biological toxicity can be enhanced. In addition, if the herbicide propanil or herbicide and organic phosphorus or carbamate insecticides are mixed and used, the degree of damage to rice will be aggravated; the combination of diannon and herbicides and emulsifiable concentrates will cause harm to the apple trees. The mixture of enemy bacteria and emulsifiable concentrates will cause harm to citrus trees; the combination of polydatin and emulsifiable concentrates will aggravate the injury to pears. In general, the use of an agent that is prone to phytotoxicity alone is mixed with an emulsifiable concentrate and aggravate the injury. The antagonism of the antagonism compound mixture to the same organism is known as antagonism when it is significantly lower than the sum of the virulence alone of the agents constituting the mixture. The antagonism is manifested in the reduction of the control effect and the reduction of the damage to the body of the protected subject. When Ruo Cao Ling and 2,4-D, Dinitro-Methyl-Nanquinone use to reduce the control effect of diterpenium on wild oats, and polyoxo- and baicalein are used together to reduce the incidence of polyoxym from Rhizoctonia solani Control effect. Antagonism also has many examples in reducing the harm to the protected object. For example, the combination of zinc sulfate and mancozeb can reduce the phytotoxicity of mancozeb. The copper preparation and streptomycin were mixed to reduce the harm caused by streptomycin to cabbage. The mixed use of triflurazion and trimethoprim reduced the phytotoxicity of oxathione to soybeans. Utilizing these antagonisms can expand the scope of application of pharmaceuticals. A mixture is best for one control object, but not necessarily for another control object. For example, carbendazim and zearalen zinc have a synergistic effect on grape gray mold, and only show additive effect on melon powdery mildew. A mixed agent is a synergistic effect to the control subjects, and does not necessarily increase the phytotoxicity to the protected objects. It is precisely because of this that it is possible to use the compounded pesticides to synthesize, add, or antagonize different organisms and screen them out. Efficient and safe ideal agent, with new features, and become a new pesticide. China Agricultural Network Editor
Goji Berry also known as wolf berry is the fruit of the Lycium barbarum or Lycium chinense, two closely related species. This kind of fruit mainly grows in China and is commonly use in Chinese daily cuisine for making soup or as tea. It`s full of nutrient value and has numerous implied health effects and has been termed as super fruit. Goji berry have three kinds of quality and different grades. The qualities are Conventional, Low pesticide and Organic. Grades are 180pcs, 280pcs, 350pcs, and 500pcs per every 50 grams.
Goji Berry
Goji Berry,Organic Goji Berry,Low Pesticides Goji Berry,Conventional Goji Berry
Ningxia Shun Yuan Tang Herbal Biotech Co., Ltd. , http://www.nxshunyuantang.com