Eriophyidae

Aceria

Quercus douglasii

California

Quercus gambelii

Arizona

Colorado

Nevada

New Mexico

Oklahoma

South Dakota

Texas

Utah

Wyoming

Quercus garryana

Oregon

Washington

British Columbia

Aceria trichophila

Aceria trichophila 

Aceria trichophila Keifer, 1955: 111.
Aceria trichophila; Amrine & Stasny, 1994: 92.
Aceria trichophila; Baker, et al., 1996: 258.

Host. Quercus douglasii (Fagaceae).

Relation to host. Galls, erineum.

Distribution. USA.

Eriophyoid mites on Fagaceae with descriptions of seven new genera and eleven new species (Acari: Eriophyoidea)

Aceria trichophila Keifer, 1955

Host: Quercus douglasii, ilex [in Spain]

Relationship: The mites produce baggy erineum-filled leaf galls 1/4 to 1/2 inch in size.

Locality: CA

Amrine Catalog

Eriophyes trichophila

Quercus douglasii, gambelii

This eriophyid mite induces large, globular erineum galls on the underside of blue oak leaves. The concave depressions are covered with whitish hairs.

Plant Galls of the Western United States

Xue et al and Amrine both list Quercus garryana as a host of Aceria mackiei, citing Bachelor's report in "The Eriophyid mites of the state of Washington." However, this is the only host of that species outside of the intermediate and red oak groups, and erineum galls [seen on Q garryana](https://www.inaturalist.org/observations/13161931) seem to more closely resemble those of Aceria trichophila, which is known from two white-group oaks in the area (Quercus douglasii and gambelii). Our host listing is tentatively adjusted to match the assumption that the gall on Q garryana is A trichophila, not mackiei. 

Gallformers ID Notes