the larva of any of several chalcid flies of the family Eurytomidae, especially of the genus Harmolita, that feeds within the stems of grasses, often causing a gall near the first joint.
Origin of jointworm
Also called strawworm.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
US the larva of chalcid flies of the genus Harmolita, esp H. tritici, which form galls on the stems of cereal plants
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012