the larva of any of several moths, as Hyphantria cunea (fall webworm) or Loxostege similalis (garden webworm) which spins a web over the foliage on which it feeds.

1790–1800, Americanism; web + worm

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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several gregarious moth larvae that spin webs over foliage on which they feed 
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Example sentences
However, winter survival of adequate webworm populations has limited this
  biological control method to date.
Carbaryl, acephate or other chemical registered for fall webworm may also be
There are several insecticides registered for garden webworm control.
Insects include fall webworm cankerworms, and apple maggot.
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