Thuja
Guides
Argyresthia thuiella
arborvitae leafminer, thuja mining moth, American thuja shoot moth
Argyresthia thuiella is a micro-moth in the family Argyresthiidae, commonly known as the arborvitae leafminer. Native to North America, it has been introduced to Europe multiple times since 1971. The species develops one generation annually, with larvae mining the foliage and twigs of Thuja and Chamaecyparis species. Adults are active from May to July and have a wingspan of approximately 8 mm.
Coleotechnites thujaella
brown arborvitae leafminer, brown cedar leafminer
Coleotechnites thujaella is a small gelechiid moth commonly known as the brown arborvitae leafminer or brown cedar leafminer. It occurs in northeastern North America, where its larvae feed internally on Thuja foliage. The species is recognized by its distinctive wing pattern of black triangular costal patches and paired black dots on cream-white forewings. Adults have a wingspan of 9–10 mm and are active in a single annual generation.
Cupressatia thujae
Cupressatia thujae is a species of gall midge in the family Cecidomyiidae. It is one of few described species in the genus Cupressatia. The species is known to induce galls on Thuja species, members of the cypress family (Cupressaceae). Very few observations exist, suggesting it may be rare, geographically restricted, or underreported.