- 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. 2018
- US the larva of chalcid flies of the genus Harmolita, esp H. tritici, which form galls on the stems of cereal plants