An apparatus 1 comprises an upper air guide hood 3 and a lower air guide hood 5 spaced from each other. Spray nozzles 7 are arranged between these two air guide hoods. The air guide hoods 3, 5 hang above or just in the tops of the crop 13. During the migration of the apparatus the crop is as it were torn open by the wind and/or by contact with the apparatus, so that the spray liquid 15 is distributed among the crop. The back of the apparatus provides a loss-free shielding by means of the air flows 17 and 21 which continue to be pointed at the crop. As a result the vapours are pressed into the crop, so that there is mention of proper penetration into the crop as well as a considerable emission reduction of the spray liquid. Emission that would otherwise be lost on drift and evaporation and rolling off of the spray liquid.
