What is an adjuvant?

• A. A chemical added to a pesticide mixture that helps the active ingredient do a better job and helps the pesticide stick to treated surfaces in bad weather.
• B. A pesticide shipping container
• C. A secondary pesticide product that is added to rotate modes of action
• D. A label requirement for packaging

Answer: (A)

An adjuvant is a supplementary chemical added to a pesticide spray to boost how well it works. It can improve wetting and spreading on plant surfaces, help the mixture stick to leaves or treated areas, and enhance performance in less favorable weather by reducing wash-off and drift. This makes the active ingredient more effective and often allows for better coverage with the same amount of product.

That option describes exactly this: a chemical added to the pesticide mixture that helps the active ingredient do a better job and helps it stick to treated surfaces in bad weather.

The other choices aren’t adjuvants. A shipping container is packaging, not a functional additive to the spray. A secondary pesticide product added to rotate modes of action relates to resistance management, not improving spray performance. A label requirement for packaging is a regulatory detail, not an additive that changes how the pesticide works.