 Bystanders include workers working at an area separate to the pesticide application are, individuals living in the surrounding areas of an application area, or individuals passing by fields as they are being treated with a pesticide.Herbicide volatilisation refers to evaporation or sublimation of a volatile herbicide.The effect of a gaseous chemical is lost at its intended place of application and may move downwind and affect other plants not intended to be affected causing crop damage.