How does a synergist affect the efficacy of a pesticide?

A synergist enhances the efficacy of a pesticide by improving the effectiveness of the active ingredient. Synergists work by either amplifying the chemical activity of the pesticide or by inhibiting the pest's ability to metabolize or break down the pesticide, thereby allowing it to remain active for a longer duration. This can lead to improved pest control outcomes, as the pesticide can be more effective at lower concentrations, reducing the likelihood of resistance development in pest populations.

Other options do not accurately capture the function of a synergist. While a synergist may also have an impact on toxicity, that is not its primary role; instead, the focus is on increasing the pesticide's effectiveness against pests. Therefore, the correct interpretation of a synergist's role is that it actively contributes to the increased efficacy of a pesticide when applied correctly.