Fenusa ulmi
Pest description and crop damage Small legless sawfly larva feed between the layers of leaf epidermis, resulting in large brown blotches. The elm leafminer, Fenusa ulmi, has been in the Northwest for a few years but has been noticeable in its expansion to new areas in Washington and Oregon recently. The sawfly attacks Scotch and Camperdown elms, Ulmus glabra), and Engish elm, U. procera.
