What is the purpose of surfactants or spreaders in pesticide formulations?

Surfactants or spreaders play a crucial role in enhancing the effectiveness of pesticide formulations by allowing the water carrier to spread more thoroughly across the surface of the target area. When a pesticide is applied, the liquid needs to cover and adhere to the surfaces of plants or soil for the active ingredients to be effective. Surfactants reduce the surface tension of the spray solution, which helps it to disperse more evenly and better penetrate the surfaces it is applied to. This improved coverage increases the likelihood that the pesticide will come into contact with pests or pathogens, thereby enhancing its efficacy.

In addition to improving spread, surfactants can also help reduce runoff and evaporation, helping pesticides to remain effective for a longer period. This is particularly important for ensuring that the pesticide remains in contact with the target organism long enough to have the desired effect.