Mountain ash sawfly, Pristiphora geniculata (Hartig), is a European tenthredinid sawfly that is invasive in North America. In North America, it feeds on species of Sorbus. Mountain ash sawfly occurs in Canada east of central Ontario and in the northeastern United States. The winter is passed as a prepupa in a cocoon in the soil or leaf litter. Pupation occurs in the spring and adults emerge soon after. Eggs are deposited in slits cut in the edges of the leaves of the host trees. Newly hatched larvae feed on the leaf edges.
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