Definition of army worm in US English:

army worm

noun

  • Any of a number of insect larvae which occur in destructive swarms.

    the caterpillars of some moths, which feed on cereals and other crops, moving en masse when the food is exhausted (Spodoptera and other genera, family Noctuidae)

    the small maggots of certain fungus gnats, which move in very large numbers within secreted slime (genus Sciara, family Mycetophilidae)

    • ‘From alfalfa weevil larvae and adults to army worms, cloverworms, cutworms, and alfalfa caterpillars to all sorts of aphids, some form of pest seems to be almost everywhere.’
    • ‘We controlled army worms by doing a two-ring perimeter around the fairway instead of spraying the whole fairway.’
    • ‘The newly seeded alfalfa has plant bugs and potato leafhoppers and established alfalfa has army worms, alfalfa loopers, thistle caterpillars, and variegated cut worms.’
    • ‘They are studying which plants a beet army worm prefers for egg laying.’
    • ‘A gene that codes for a single myosuppressin FLRFamide has been found in Drosophila, the cockroach Diploptera punctata, and the true army worm Pseudaletia unipuncta.’