The dosage applied by a sprayer can be decreased by which of the following actions?

Increasing the speed of travel while spraying reduces the amount of pesticide delivered to a specific area over a period of time. When a sprayer moves faster, the area covered increases, but the volume of pesticide applied per unit area tends to decrease because the sprayer has less time to deposit the same amount of product on the surfaces being treated. This results in a lower dosage being applied overall.

In contrast, other options suggest actions that typically do not lead to a decrease in dosage effectively. Walking at a steady pace ensures that a consistent rate of application is maintained, while using less water in the mix might alter the concentration of the solution but does not directly correlate to a reduced dosage. Adjusting to a larger nozzle would generally increase the flow rate and likely lead to a higher dosage being applied, counter to the goal of reducing dosage. Therefore, the best method for decreasing the dosage is by increasing travel speed.