The rise of pesticide resistance in roaches affects control by

• A. Increasing effectiveness
• B. No effect
• C. Reducing effectiveness
• D. Making roaches more susceptible

Answer: (C)

Pesticide resistance means roaches survive treatments that used to kill them, so the overall impact of the chemical drops. As resistance grows, a given product kills a smaller fraction of the population, making control less effective. Surviving roaches reproduce and spread the resistant traits, so the population can rebound after treatment and continue to persist. That’s why this situation reduces effectiveness rather than increasing it or having no effect, and certainly not making roaches more susceptible. In practice, address it with an integrated approach: rotate products with different modes of action, combine chemical controls with sanitation and exclusion, and monitor resistance patterns to adapt strategies.