Rhizome-gall
Guides
Eurosta comma
Eurosta comma is a tephritid fruit fly that forms rhizome galls on goldenrod host plants (Solidago missouriensis). As a rhizome-galling specialist, it diverts host plant resources toward root tissue and away from vegetative growth, significantly reducing the host's ability to produce new rhizomes. The species interacts indirectly with other herbivores such as the leaf beetle Trirhabda canadensis by impairing the host plant's capacity to recover from defoliation.