How should a QS handle changes in pesticide labels after purchase?

• A. Ignore changes and continue as before.
• B. Treat the new label as the controlling instruction and update site practices, training, and records accordingly.
• C. Apply only the old label until you run out.
• D. Use the new label but disregard new safety notes.

Answer: (B)

The key idea is that pesticide labeling is the binding, current instruction for use. When a label changes after purchase, the most up-to-date labeling governs how the product can be used, stored, and disposed, and it sets the required safety measures. A qualified supervisor must ensure site practices reflect that current label, update training materials, and revise records to match the new requirements. This means adjusting application methods, PPE, reentry intervals, timing, and any other labeled requirements, so that everything workers do aligns with the current instructions.

Using an older label or ignoring updated safety notes would violate labeling requirements and potentially put workers and the environment at risk. Therefore, treating the new label as controlling and updating practices and records accordingly is the correct approach.