Reducing drift can also involve using which type of additives in the spray mixture?

Using surfactants in the spray mixture is a common method to reduce drift when applying pesticides through aerial application. Surfactants enhance the effectiveness of the spray by improving the wetting, spreading, and penetration of the pesticide on the target surface. They help to modify the surface tension of the spray droplets, which can lead to larger droplet sizes that are less prone to drift. By ensuring that the pesticide adheres better to the intended surface, surfactants help minimize the amount of product that is carried away by wind and other environmental factors.

The other choices may serve important functions in agriculture but do not primarily focus on reducing drift during aerial applications. Insecticides, fertilizers, and herbicides are primarily active ingredients aimed at pest control, nutrient supply, or weed management, rather than reducing the physical dynamics of pesticide application such as droplet size and trajectory.