Noun plant louse has 1 sense
  1. plant louse, louse - any of several small insects especially aphids that feed by sucking the juices from plants
    --1 is a kind of homopterous insect, homopteran
    --1 has particulars:
     aphid; adelgid; grape louse, grape phylloxera, Phylloxera vitifoleae; jumping plant louse, psylla, psyllid; oak blight
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