from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various usually destructive caterpillars that construct webs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of various caterpillars, mostly of the family Pyralidae, that spin a web.
from the GNU version of the Collaborative International Dictionary of English
- n. Any one of various species of moths whose gregarious larvæ eat the leaves of trees, and construct a large web to which they retreat when not feeding.
from The Century Dictionary and Cyclopedia
- n. Any one of several lepidopterous larvæ which feed more or less gregariously, and spin large webs into which they retire at night, or within which they feed during the day until the contained foliage is entirely devoured, when the web is enlarged.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. several gregarious moth larvae that spin webs over foliage on which they feed
The leaves are eaten by mimosa webworm in some areas of North America.
~Fall webworm, ~  ~walnut caterpillar, ~  ~and hickory tussock moth.
This insect can be controlled with the same spray treatments that are recommended for the fall webworm, and also by crushing or burning the caterpillars when they are clustered on the lower limbs or tree trunks.
The fall webworm  and the walnut caterpillar  are the leaf-feeding caterpillars most commonly reported as attacking northern tree nuts.
On other hand, the injuries caused by such insects as the webworm, the walnut caterpillar, the pecan leaf case-bearer, the Japanese beetle, and others are somewhat spectacular in that the leaves may be partly or completely consumed on portions of the trees.
In the East injury is confined largely to certain caterpillars infesting the foliage, as the white-marked tussock moth, the fall webworm, a species of _Datana_, and occasionally reports of severe injury from red spider are received.
•Treat chinch bug or sod webworm problems in the lawn.
In fact, I don't consider webworm all that big of a problem.
Those small white moths are usually the adult form of sod webworm.
I only recommend control treatments if damage is occurring in the grass and, before starting webworm control, you want to make sure that it is webworm that's doing the damage.