Abstract: Disclosed is a method for inhibiting regrowth of foliage of a crop plant being conditioned for harvest or after harvest comprising applying to the plant foliage a regrowth-inhibiting effective amount of a compound of Formula 1, an N-oxide or a salt thereof, wherein R1, R2, R3, W and X are as defined in the disclosure. Also disclosed is a harvest aid mixture for causing prolonged defoliation of a crop plant, such as cotton, being conditioned for harvest comprising a compound of Formula 1 and at least one compound acting as a defoliant or desiccant. Also disclosed is a method for inhibiting regrowth of foliage of a crop plant, such as cotton, comprising applying an effective amount of a compound of Formula 1 and at least one compound selected from compounds acting as a defoliant or desiccant.