Commonly used pesticide formulations and characteristics in orchard 1. Wettable powder The wettable powder is a dosage form that uses a pesticide original drug , an inert filler and a certain amount of auxiliary agent, and is mixed and pulverized in proportion to achieve a certain fineness of the powder. Wettable powders do not use solvents and emulsifiers. They are safer for plants and can be used before fruit bagging to avoid the stimulation of fruit surfaces by organic solvents.
Commonly used varieties are: 10% imidacloprid powder, 70% methyl thiophanate powder, 80% large powder.
2. Water-dispersible granules Water-dispersible granules are obtained by mixing and processing granules of solid pesticides with moisturizing agents, dispersing agents, thickeners and other auxiliary agents and fillers, which can rapidly disintegrate in water and disperse into suspension agents. . The water-dispersible granule has the characteristics of good fluidity, convenient use, good storage stability, high content of active ingredients, and the advantages of wettable powder and suspending agent. The active ingredient of the water-dispersible granules is generally from 50% to 90%.
Commonly used varieties are: 50% imidacloprid water-dispersible granules and the like.
3. Water agents Any pesticide that dissolves in water and does not decompose in water can be formulated into a liquid. The aqueous solution is an aqueous solution of the original pesticide, and the agent is uniformly dispersed in water in an ion or molecular state. The concentration of the drug depends on the water solubility of the original drug, and generally its maximum solubility is diluted with water when used. The water agent has less pollution to the environment and is a dosage form for future development.
Common varieties are: 2% avidin water, 40% amphetamine water and so on.
4. Suspension suspensions are also called suspensions. A viscous flowable suspension prepared by ultrafine pulverization using a raw powder of a water-insoluble solid pesticide plus a surfactant and water as a medium. Compared with wettable powder, it has the characteristics of small particle diameter, no dust pollution, strong penetrating power and high efficacy. It has the advantages of both wettable powder and emulsifiable concentrate, and can be mixed with water.
Need to pay attention: after long-term storage, the suspension may be precipitated due to the sinking of suspended particles. It must be shaken thoroughly during use to resuspend the lower particles to ensure the efficacy.
Commonly used varieties are: 40% carbendazim suspension.
5. Dairy emulsifiable concentrate is a transparent liquid prepared by dissolving water-insoluble original drug plus organic solvent stupid, xylene, etc. and emulsifier. It is generally not turbid, stratified and precipitated after being sealed and stored at room temperature for two years. It can be quickly and evenly dispersed into an opaque emulsion. The characteristics of emulsifiable concentrate are: high efficacy, convenient application and stable nature. Because of the long history of emulsifiable concentrate and mature processing technology, it has many varieties, large yield and wide application range. It is a major dosage form of pesticides in China. The active ingredient content of the emulsifiable concentrate is generally between 20% and 90%.
Common varieties are: 10% triadimefon EC, 25% scorpion chlorate, 25% hunted emulsifiable concentrate, 20% daisy emulsifiable concentrate.
Need to pay attention to: the organic solvent in the cream dosage form has a stimulating effect on the young fruit of apple and pear, which can increase the pores of the fruit surface and reduce the smoothness of the fruit surface. Therefore, the bagging should not be applied as much as possible, especially some sensitive tree species and varieties. Do not apply.
6. Thick emulsion thick emulsion is also called water emulsion. It is made of water-insoluble type by adding water-soluble pesticides, emulsifiers, dispersants, stabilizers, thickeners, cosolvents and water. Emulsion, opaque appearance. Compared with emulsifiable concentrate, it has the advantages of saving solvent and less environmental pollution, and its efficacy is comparable to that of emulsifiable concentrate. It is a new formulation with promising prospects. This preparation can be used after dilution with water.
7. The microemulsion microemulsion is prepared by adding an active ingredient of the medicament to an emulsifier, an antifreeze and water, and is a transparent or translucent liquid, which has small environmental pollution and low irritation of the medicament. Use before the fruit is bagged to avoid damage to the young fruit by the emulsifiable concentrate. Since the formed emulsion particles have a very small diameter, the white emulsion formed when the emulsifiable concentrate is watered is not seen when used with water, and is therefore called water-based emulsifiable concentrate and solubilized emulsifiable concentrate.
Common varieties are: 16% high-efficiency inulin microemulsion, 4.5% high-chlorine microemulsion.
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