webworm

[web-wurm]
noun
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.

Origin:
1790–1800, Americanism; web + worm

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
webworm

noun
several gregarious moth larvae that spin webs over foliage on which they feed 
WordNet® 3.0, © 2006 by Princeton University.
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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
  used.
There are several insecticides registered for garden webworm control.
Insects include fall webworm cankerworms, and apple maggot.
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