title: Efficiency of alfalfa mosaic virus transmission by aphids in relation to the level of virus in plants.
mesh_terms: D000818:Animals; D001042:Aphids; D007303:Insect Vectors; D000455:Medicago sativa; D010935:Plant Diseases; D010942:Plant Viruses / Q000302:isolation & purification; D010945:Plants, Edible; D010947:Plants, Toxic; D014026:Nicotiana