The Collaborative International Dictionary of English v.0.48:

Roseworm \Rose"worm`\, n. (Zool.)
   The larva of any one of several species of lepidopterous
   insects which feed upon the leaves, buds, or blossoms of the
   rose, especially Cacaecia rosaceana, which rolls up the
   leaves for a nest, and devours both the leaves and buds.
   [1913 Webster]