Which formula is used to calculate the efficacy of an adulticide in terms of percent reduction or percent mortality?

The correct choice focuses on Abbott's formula, which is specifically designed to calculate the efficacy of an adulticide by determining the percentage of mortality resulting from the treatment. This formula accounts for the control and treated groups, allowing practitioners to accurately assess the impact of the adulticide on mosquito populations.

In addition to Abbott's formula, Mulla's formula is often employed as well in the context of assessing adulticide efficacy. Mulla’s formula provides a more direct method for evaluating the effectiveness of various treatments by using mortality data from different concentrations or exposure times. Utilizing these formulas together gives mosquito control professionals a reliable means of quantifying how effectively an adulticide reduces mosquito populations in the field.

Understanding these methods is crucial in mosquito control programs as they help ensure the selected chemicals are performing as intended, thus protecting public health while minimizing environmental impacts.