Growing-degree-days
Guides
Fenusa pumila
birch leafminer, Birch Leafminer Sawfly
Fenusa pumila is a sawfly species in the family Tenthredinidae, commonly known as the birch leafminer. Native to Europe, it has been introduced to North America where it has become established. The species is a specialist leaf-mining herbivore on birch trees, with larvae feeding internally within leaf tissue. In North America, populations may complete two to four generations annually, with adult emergence triggered by accumulated growing degree-days.