Plant material has bacteriophage has been attached, wherein the bacteriophage retains infectivity. The plant material includes fruits, vegetables, leaves, stems, flowers, roots, tubers, seedlings and seeds. Plant diseases and animal diseases can be treated. A separate composition comprises a carrier selected from (i) a filament, (ii) a planar material, and (iii) particles and/or beads, and bacteriophage covalently attached thereto, wherein the bacteriophage retains infectivity, useful in treatment or prevention of bacterial infection in a deep wound.
