What typically happens when surfactants are added to a pesticide formulation?

When surfactants are added to a pesticide formulation, they enhance the ability of droplets to cover target surfaces. Surfactants, or surface-active agents, work by reducing the surface tension of water, allowing pesticide droplets to spread more uniformly over the plant surfaces and penetrate more effectively into the areas of interest. This improved coverage is crucial for maximizing the efficacy of the pesticide, as good coverage ensures that a larger area is treated and increases the likelihood of pest contact with the active ingredients.

The use of surfactants can also facilitate better adhesion of the pesticide to the target surface, helping to prevent runoff due to rain or irrigation, although that is not the primary aspect of the correct answer. Other options may involve changes in physical properties or performance attributes that do not directly relate to the primary function of surfactants in formulations.