the caterpillar of a noctuid moth, Pseudaletia unipuncta, that often travels in large numbers over a region, destroying crops of wheat, corn, etc.
any of the larvae of several related moths having similar habits.

1735–45, Americanism; army + worm Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To armyworm

1. noctuid moth larvae that travel in multitudes destroying especially grass and grain 
2. moth whose destructive larvae travel in multitudes 
3. larva of fungus gnat that feed on cereals and other grains; they march in large companies in regular order when the food is exhausted 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Physiological and biochemical bases of fall armyworm resistance in the seedlings of maize inbred lines.
Pheromone traps were used to collect fall armyworm moths from several areas of the state.
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