Intertaxon relationships
Didymascella thujina (E.J. Durand) Maire
Gymnosporangium sabinae (Dicks.) G. Winter - Juniper-pear Rust 
Kabatina thujae R. Schneid. & Arx
Argyresthia thuiella (Packard, 1871)
Pachyrhinus lethierryi (Desbrochers des Loges, 1875)