Matchweed
Guides
Asteromyia gutierreziae
matchweed stem gout
Asteromyia gutierreziae is a gall midge in the family Cecidomyiidae that induces galls on various plants in the Asteraceae family. The species is black in color and measures approximately 3–5 mm in length. It has been documented on multiple host plants including species of Gutierrezia, Baccharis, and related genera. The common name 'matchweed stem gout' reflects its association with matchweed plants and its gall-forming habit.