Species: Eriophyes lionotus
Leaves of Betula occidentalis bearing numerous short finger galls were collected Sept. 10, 1968, along a stream bed on the outskirts of Estes Park, Colo.
Hosts: Betula occidentalis

Species: Vasates oldfieldi
Description: In numerous, short finger galls on leaves
Originally described as Eriophyes lionotus (Nalepa) by Wilson & Oldfield, 1970.
Hosts: Betula occidentalis

Species: Vasates oldfieldi
All three species are targeted by what has been identified morphologically as a single species of gall‐inducing mite (Vasates olfieldi) resulting in white to red bulbous protuberances on the adaxial surface of leaves.
Hosts: Betula neoalaskana, Betula occidentalis, Betula glandulosa
[Add image]