strawworm

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A larva of a chalcid wasp, Tetramesa grandis, of western North America, that infests wheat and reduces yield.

from The Century Dictionary.

• noun The larva of a trichopterous neuropterous insect; a caddisworm: so called from the bits of straw of which it builds its case. See cut under caddis-worm.

from the GNU version of the Collaborative International Dictionary of English.

• noun A caddice worm.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The grub of the caddis fly.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun larva of the caddis fly; constructs a case of silk covered with sand or plant debris
• noun larva of chalcid flies injurious to the straw of wheat and other grains