A mobile agricultural spray apparatus, the spray apparatus including at least one spray nozzle arranged to be on one side of a crop during spraying and an overspray collector arranged to be on the opposite side of the crop during spraying such that the overspray collector can capture overspray from the spray nozzle during operation, wherein the overspray collector includes: at least two curtains, the curtains including at least one pervious and flexible front curtain and an impervious rear curtain； an overspray space between the pervious front curtain and the impervious rear curtain； and an overspray chamber in fluid communication with at least the overspray space for collection of overspray captured by the overspray collector.
