Since it is reported that lungworm larvae may survive in the subsoil for up to two years, pasture contamination must be considered. Harrowing permanent pasture will reduce larvae and ploughing or crop rotation will eliminate larvae. Grass in hedgerows may, however, become a source of reinfection. | Since it is reported that lungworm larvae may survive in the subsoil for up to two years, pasture contamination must be considered. Harrowing permanent pasture will reduce larvae and ploughing or crop rotation will eliminate larvae. Grass in hedgerows may, however, become a source of reinfection. |