Definition of webworm in US English:

webworm

noun

North American
  • A caterpillar which spins a web in which to rest or feed. When present in large numbers it can become a serious pest.

    Loxostega and other genera, family Pyralidae

    • ‘These webworms behave a lot like thistle caterpillars in soybeans.’
    • ‘The small growth wasn't trimmed so the poor things are bushy and horrible, not to mention that the branches are full of webworms.’
    • ‘We have had a severe infestation of webworms in our trees this summer.’
    • ‘We saw a very heavy flight of sugarbeet webworms last week and may begin to see larval feeding over the next week or so.’
    • ‘In addition to abiotic factors, Weakley and Bucher suggest that predation by webworms is a major source of mortality and lowered fecundity for Amaranthus pumilus.’
    • ‘The product works as either a preventive or curative control for fire ants, mole crickets, sod webworms, cutworms, armyworms and chinch bugs.’
    • ‘Of these pests, the mimosa webworm is the most serious, especially for thornless varieties.’
    • ‘Butterfly larvae tend to be solitary, or sparsely distributed, whereas pest caterpillars, such as fall webworm, make tents and hatch in the hundreds.’
    • ‘Several generations of garden webworms develop each season, the last of which may overwinter in the soil in the pupal stage.’
    • ‘We're in the middle of a terrible drought, wool prices are the lowest they've been for ten years, the webworm outbreak has wiped out half the crops, and the banks are cutting back our overdrafts.’

Pronunciation

webworm

/ˈwebwərm/