#leaf_blight  any blight causing a browning and falling of the leaves of a plant
  supertype:  #blight  any plant disease resulting in withering without rotting
  subtype:  #fire_blight__pear_blight  a disease blackening the leaves of pear and apple trees
     subtype:  #blight_canker  a phase of fire blight in which cankers appear
  subtype:  #needle_blight__needle_cast__leaf_cast  a disease of conifers causing the needles to fall

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