Explanation of Names
Pristiphora (Pristiphora) geniculata (Hartig 1840)
native to Europe, adventive in NA; widespread in ne. US & Canada; "common east of the Mississippi River"(1)
First detected in Washington State in 2009, and now common throughout the Puget Sound region
Main host: Mountain-ash (Sorbus)
Overwinters as cocoon in the dirt. Two generations in the south, one in the north. First generation usually emerges in June and the second at the end of July.
larva can cause extensive damage to leaves but rarely kills the host
earliest record in our area: NY 1926
Looney, C., Smith, D. R., Collman, S. J., Langor, D. W., & Peterson, M. A. (2016). Sawflies (Hymenoptera, Symphyta) newly recorded from Washington State. Journal of Hymenoptera Research, 49, 129.