#yellow_dwarf  any of several virus diseases of plants characterized by stunting and yellowing of the leaves
  supertype:  #plant_disease__plantdisease  a disease that affects plants
  subtype:  #yellow_dwarf_of_potato__potato_yellow_dwarf  the yellow dwarf disease of potato plants
  subtype:  #onion_yellow_dwarf  the yellow dwarf disease of onion plants

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