What is a pesticide adjuvant?

Pesticide adjuvants are auxiliary substances that are added during the processing or use of pesticide preparations to improve the physical and chemical properties of pharmaceuticals.
They are also called pesticide adjuvants
.
The adjuvant itself has basically no biological activity, but it can affect the control effect
.
There are many varieties of pesticides, with different physical and chemical properties, and different formulation processing requirements, so the required additives are also different
.
When the filler or carrier solid pesticide formulation is processed, it is a solid inert mineral, plant or synthetic substance added to adjust the content of the finished product or improve the physical state
.
Commonly used are attapulgite, diatomite, kaolin, clay and so on
.
One of its functions is to dilute the original drug, and the other is to adsorb the original drug
.
Mainly for the production of powders, wettable powders, granules, water dispersible granules or the like
.
Solvents are used to dissolve and dilute the effective ingredients of pesticides, making them easy to process and use organic matter
.
Commonly used are xylene, toluene, benzene and so on
.
Mostly used for processing emulsifiable concentrate
.
It requires strong dissolving power, low toxicity, high flash point, non-flammable, low cost, and wide sources
.
Emulsifiers are incompatible with two-phase liquids (such as oil and water).
One phase of the liquid can be stably dispersed in the other phase with tiny droplets to form an opaque or translucent emulsion.
This kind of surface active agent is called emulsifier
.
Such as calcium dodecylbenzene sulfonate
.
It is mostly used for processing emulsifiable concentrates, water emulsions and microemulsions
.
Wetting agent, also known as wetting agent, is a type of surfactant that significantly reduces the liquid-solid interfacial tension, increases the contact of the liquid to the solid surface, or increases the wetting and spreading of the solid surface
.
Such as saponins, sodium lauryl sulfate, pull open powder and so on
.
It is mainly used in the processing of wettable powders, water dispersible granules, water and water suspension agents, and as a spray assistant
.
The dispersant is a surfactant that can prevent the solid particles in the solid-liquid dispersion system from agglomerating during the processing of the pesticide preparation, so that it can remain uniformly dispersed in the liquid phase for a long time
.
Such as sodium lignosulfonate, NNO, etc.

.
Mainly used in the processing of wettable powders, water dispersible granules and water suspension agents
.
Penetrants can promote the effective ingredients of pesticides to enter the surface active agents of the treatment objects, such as plants and harmful organisms.
They are mostly used in the preparation of hypertonic pesticide formulations
.
Such as penetrant T, fatty alcohol polyoxyethylene ether and so on
.
Adhesives are additives that increase the adhesion of pesticides to solid surfaces
.
Due to the improved adhesiveness of the agent, it is resistant to rain washing and improves the durability
.
For example, add an appropriate amount of mineral oil with higher viscosity to the powder, and add an appropriate amount of starch paste, gelatin, etc.
to the liquid pesticide
.
There are two types of stabilizers: one type can inhibit or slow down the decomposition of active ingredients of pesticides, such as antioxidants, anti-photolytic agents, etc.
; the other type can improve the physical stability of the formulation, such as anti-caking agents and anti-settling agents
.
The synergist itself has no biological activity, but can inhibit the detoxification enzyme in the organism.
When mixed with certain pesticides, it can greatly improve the toxicity and efficacy of the pesticide
.
Such as synergist phosphorus, synergist ether and so on
.
It is of great significance for the prevention and control of resistant pests, delaying resistance to pesticides and improving control effects
.
The safener reduces or eliminates the phytotoxicity of herbicides to crops, and can improve the safety of herbicides when used
.
In addition, there are auxiliaries such as foaming agents, defoamers, antifreeze agents, preservatives, and warning colors
.
Pesticide spray auxiliaries are divided into two categories: one, active auxiliaries, which include surfactants, wetting agents, oil-based agents, adhesives and penetrating agents
.
2.
Special-purpose spray additives, which include buffering agents or acidifiers or pH change agents, water quality regulators, anti-drift agents, thickeners, and admixtures
.
Correctly choose and use pesticide spray additives 1.
Choose agricultural spray additives specially developed for agricultural and forestry, such as agricultural silicone additives.
Do not use industrial products or household detergents or washing powders to avoid destroying the activity of pesticides
.
2.
Many pesticide formulations already contain necessary additives to improve the performance of pesticides, and spray additives are generally not used
.
3.
It is believed that the spray adjuvant to be used has undergone a complete efficacy test, and the products with doubts or uncertainties should be tested in a small area before being used in a large area
.
4.
Specific pesticides need specific additives, and the additives should be selected correctly when using them
.
5.
The recommended pesticide adjuvants may change due to changes in formulations, or due to changes in application techniques and procedures
.
6.
Pesticide spray additives are not required under any spray conditions
.
A chemical liquid immersion test can be performed to test whether the spray liquid contains excessive wetting agent
.
7, good mix formulated pesticide safety, compatibility and effectiveness of the records, including pesticide formulations, spray additives, such as dose
.
Improper use or excessive use of spray adjuvants may reduce the efficacy or cause phytotoxicity
.
Read the labels of pesticides and adjuvants carefully to ensure that the selected adjuvant matches the application site, target pests, and equipment, as well as the pesticides used
.
The correct selection process of pesticide spray adjuvant 1.
What is the target? 2.
Read the pesticide label a.
Are there any recommended additives? b.
What type of adjuvant can be used for this pesticide? 3.
Is it the necessary additives? a.
No water quality is recommended on the pesticide label.
There is no expert advice for the best spray coverage area.
There is no expert recommendation.
b.
Read the spray adjuvant label to see if the active ingredients are compatible with pesticides.
Dosage target is weed or crop 4.
Penetrant use It is used for herbicides to assist systemic herbicides to resist rain erosion.
5.
Super dispersant reduces water consumption and improves penetration of plants.
Consult expert opinions.
6.
Wetting agent/spreading agent for waxy/difficult to wet The target for crop phytotoxicity may already contain a wetting agent in the light dosage form.
7.
Adhesives/special agents last for several hours and rain affects the efficacy of contact pesticides.
The application of pesticides before harvest may increase the persistence of pesticide residues8 .
Buffer/acidifier reduces the PH value of water, buffer spray solution promotes the compatibility of the mixed solution 9.
Water softener/admixture softens hard water, purifies dirty water and improves the compatibility of pesticides.
In short, it is very important to select and use pesticide spray additives correctly.
Important
.
At present, the most used pesticide spray additives are agricultural silicones and plant essential oils.

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Article source: Public welfare plant protection, please indicate the source for reprinting