Kaltenbachiella ulmifusa (Walsh & Riley)

Galls on Ulmus rubra are large, spindle-shaped, bag-like, about 2.5 cm long, green when young and becoming straw-coloured when mature, projecting upward from mid-rib of leaf (fig. 134I and Patch 1910b). Emigrant alatae, BL 1.4-1.5 mm, with media either unbranched or once-branched, leave galls in June-July to found colonies on roots of Lamiaceae; successful transfers were made to Lycopus virginicus (Smith 1985). Apterous exules are yellowish orange with wax-wool (C.F. Smith, pers. comm.); BL unrecorded. Distributed throughout the range of U. rubra in North America, and recently reported (on Ulmus) in China (Jiang et al. 2004).

Pemphigus fusus Walsh and Riley

Pemphigus ulmi-fusus Walsh and Riley

A spindle-shaped, hollow gall on the upper side of the leaf with the opening below. Varying in size, about 15 mm long. Not common. On slippery elm, Ulmus fula. Summer.

Gobaishia ulmifusus

Ulmus

Spindle-shaped hollow leaf gall, length 1/2 inch, aphid, summer