"Causes woody, tapered swellings in stems of Hyssop-leaved Thoroughwort and Common Boneset, usually near the upper part of the flowering stems" (Gagné, 1989/via BugGuide).
There are 10 records in the project database.
GA | AL | WA | FR | CL | MO | HO | BA | BC | HA | CE | PG | AA | CV | CH | SM | KE | QA | CN | TA | DO | WI | SO | WO |