What is the purpose of adding an adjuvant to herbicide applications?

• A. To improve spray coverage, wetting, or penetration, as directed by the label.
• B. To increase pesticide volatility.
• C. To reduce storage stability.
• D. To decrease cost.

Answer: (A)

Adjuvants modify how the spray behaves on plant surfaces, mainly by improving wetting and spreading so the herbicide makes better contact with the leaf and can penetrate more effectively. Lower surface tension lets droplets spread out rather than bead up, which enhances coverage on the leaf, and some adjuvants help the herbicide move through the leaf cuticle or surface barriers. This leads to more efficient uptake at the labeled rate. The label guides which adjuvant to use and at what rate to ensure compatibility, crop safety, and performance. Adjuvants aren’t intended to increase volatility, compromise storage stability, or directly reduce costs.