strawworm

from WordNet (r) 3.0 (2006)

strawworm
    n 1: larva of the caddis fly; constructs a case of silk covered
         with sand or plant debris [syn: {caddisworm}, {strawworm}]
    2: larva of chalcid flies injurious to the straw of wheat and
       other grains [syn: {strawworm}, {jointworm}]

from The Collaborative International Dictionary of English v.0.48

Strawworm \Straw"worm`\, n.
   A caddice worm.
   [1913 Webster]