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Adjuvants in Pesticides

One type of adjuvant, surfactants, are used to help droplets of an herbicide stick and spread on a leaf surface.

Adjuvants are added to products to help the pesticide do its job and stay on target. They may be in a formulated product when it's purchased. Or, they may be added to a mixture before it is applied (tank-mixed).

Many adjuvants are surfactants. Surfactants are also called "surface acting agents" or wetter-spreaders. They flatten and spread droplets so that a product can penetrate a leaf.

An adjuvant may be in a product for many reasons, including to:

Factors to consider:

If you have questions about this, or any pesticide-related topic, please call NPIC at 800-858-7378 (8:00am - 12:00pm PST), or email us at npic@ace.orst.edu.

Additional Resources:

Last updated July 12, 2021

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