webworm

Any of various usually destructive caterpillars that construct webs.

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.

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.

Any of various caterpillars, mostly of the family Pyralidae, that spin a web.

several gregarious moth larvae that spin webs over foliage on which they feed