any of various related insects having similar habits.
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How to use plant louse in a sentence
On the 4th of August, about one o'clock in the afternoon, I put into solitary confinement a plant-louse of the third generation.
The Red Ant (Formica rufa) is singularly adroit in seizing the droplet left it by the plant-louse.
On one of these leaves he placed a plant-louse, which was born under his own eyes, of a wingless mother.
When they have got possession of a plant-louse, they excite it to secrete this liquid, but without doing it any harm.
Sometimes house plants, and out-door plants as well, become covered with a small, green insect called the plant louse or aphis.The First Book of Farming | Charles L. Goodrich
British Dictionary definitions for plant louse
another name for an aphid
jumping plant louse any small active cicada-like insect of the homopterous family Psyllidae (or Chermidae), having hind legs adapted for leaping, and feeding on plant juices
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012