Meaning of spotted alfalfa aphid

spot'ted alfal'fa a"phid

Pronunciation: [key]
  1. a pale yellowish aphid, Therioaphis maculata, of the southern U.S., esp. west of the Mississippi River, that is marked with black spots and has fine spines on its back: a pest mainly of alfalfa and some other legumes, as clover.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.