• WordNet 3.6
    • n webworm several gregarious moth larvae that spin webs over foliage on which they feed
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Webster's Revised Unabridged Dictionary
    • n Webworm (Zoöl) 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.☞ The most destructive webworms belong to the family Bombycidæ, as the fall webworm (Hyphantria textor), which feeds on various fruit and forest trees, and the common tent caterpillar, which feeds on various fruit trees (see Tent caterpillar, under Tent.) The grapevine webworm is the larva of a geometrid moth (see Vine inchworm, under Vine).
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Century Dictionary and Cyclopedia
    • n webworm 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. The tent-caterpillars, Clisiocampa americana and C. sylvatica, are web-worms. (See cut under tent-caterpillar.) The fall web-worm is the larva of the bombycid Hyphantria cunea. The garden web-worm is the larva of Eurycreon rantalis, a pyralid moth of the family Botidæ. This species is not gregarious, but the larvæ form individual webs near the roots of corn, cotton, cabbage, melon, potato, and other cultivated crops in the western United States.
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In literature:

The Fall Webworm, Farmers' Bulletin 99, U. S. Department of Agriculture.
"Northern Nut Growers Association, Report of the Proceedings at the Fourth Annual Meeting" by Various

In news:

Sod webworm takes a bite out of Marco.
The most damaging is the tropical sod webworm .
Adults of the sod webworm are small, brown moths with a wingspread of about 3/4 inch.
These could be the adult stage of sod webworms, army worms, cutworms or grass loopers.
Sod webworm takes a bite out of Marco.
The most damaging is the tropical sod webworm.