The present invention relates to a spray apparatus (10) for a vehicle. It is described to provide (210) a processing unit with at least one image of an environment. The processing unit analyses (220) the at least one image to activate at least one chemical spray unit mounted on a vehicle. A liquid chemical is ejected (230) by the at least one chemical spray unit. Air is blown (240) by at least one air blower mounted on the vehicle into a first downward directed air flow with respect to a fore-aft axis of the vehicle that is parallel to the ground. Air moving as a consequence of movement of the vehicle is directed (250) by at least one diverter mounted on the vehicle into a second downward directed air flow with respect to the fore-aft axis of the vehicle. A chemical spray unit of the at least one chemical spray unit is positioned relative to one or more air blowers of the at least one air blower and is positioned relative to one or more air diverters of the at least one air diverter such that the ejected liquid chemical is at least partially entrained within the first downward directed air flow and is at least partially entrained within the second downward directed air flow.
