Which of the following is considered a misuse of a pesticide?

• A. Applying a pesticide at less frequent intervals
• B. Applying a pesticide at more frequent intervals than listed on the label
• C. Mixing and applying a pesticide with a fertilizer, although not labeled
• D. Treating for a pest that is NOT listed on the label, but the site treated is listed

Answer: (B)

Following the label’s instructions is essential because the label is the controlling guide for safe and legal use. The most clear misuse here is applying a pesticide more often than the label allows. When you exceed the specified interval, you increase exposure to people, pets, beneficial organisms, and the environment, raise the risk of residues and runoff, and encourage the pest to develop resistance. All of this makes it unsafe and illegal to use the product beyond what the label permits.

Less frequent applications aren’t automatically misuse; labels set a maximum frequency, and using fewer applications may still comply with the label, though it can reduce effectiveness. Mixing a pesticide with a fertilizer when the label doesn’t authorize it is risky and not allowed unless the label explicitly states it’s a compatible tank mix. Treating for a pest not listed on the label but the site is listed can also be inappropriate, depending on the label’s instructions, but the clearest and most universally correct misuse across products is exceeding the labeled application interval.