What should you do if you observe insects still present after a labeled spray interval?

• A. Reassess pest population, monitor for resistance, rotate to a different mode of action, and consider non-chemical controls; do not exceed label rate.
• B. Immediately increase the label rate on the next spray.
• C. Switch to a different chemical with the same mode of action.
• D. Reassess pest population, monitor for resistance, rotate to a different mode of action, and consider non-chemical controls; do not exceed label rate.

Answer: (D)

When insects persist after the labeled spray interval, the best approach is to adopt an integrated pest management plan rather than just pushing more chemical. Start by reassessing the pest situation: confirm the pest identity, verify that the infestation level justifies control, and check that the spray coverage, timing, and application were appropriate. Then consider resistance as a possible reason for lack of control and monitor for it over time, keeping records of products used and timing.

Because resistance can develop with repeated use of the same mode of action, rotate to a product with a different mode of action. This reduces the selective pressure on the pest population and helps maintain long-term control options. Along with chemical changes, incorporate non-chemical controls where feasible—sanitation, exclusion, habitat modification, and biological or cultural tactics—to lower pest pressure without relying solely on pesticides.

Always stay within the label: exceeding label rates does not guarantee better control and can increase risks to non-target organisms, the environment, and resistance development. If after taking these steps the pest remains, adjust the overall management plan rather than simply increasing application rate or using the same mode of action again.