Aceria calaceris

Aceria abalis

Aceria caliberberis

Aceria dracunculi

Eriophyes prunandersoni

Eriophyes calaceris

Hosts: Acer glabrum

The mite is found in and presumably causes the magenta-colored erineum on the tips of the leaves of its host. This erineum is composed of hollow capitate hairs, containing magenta-colored fluid.

White erineum on the leaves of big- leaf maple, Acer macrophyllum, proves to have the same complex of mites as this magenta erineum, although the precise relationships have not been determined. (Two other mites found in this magenta erineum are listed under the names Vasates glabri and V. paraglabri.) Banks in 1907 gave the catalog name ryderi to a mite which was the subject of a short article in 1879 by J. A. Ryder. This name was then the one available for maple erineum mites in North America and Essig (1926) used it for white erineum mites on California maple. Leonard (1928) uses this name for maple mites in New York State. However, Hodgkiss (1930) after a careful study of New York maple mites concludes that there is no way to apply the name. The writer, on examining Ryder's original article finds that while Ryder states the mite he saw to be a Phytoptus, he has omitted any mention of a locality, or the color of the erineum inhabited by the mites, or the precise species of maple infested. The conclusion here presented is that the name ryderi is useless.

Eriophyes abalis , 
Type locality: Sacramento
Type host: Artemisia heterophytla [Artemisia douglasiana] Nutt., wormwood
Relation to host: The mites cause erineum pockets on the undersides of the leaves. These pockets bulge out on the upper surface. The extra growth of hair mikes the pockets white below. 

Type host: Berberis californica Jepsan [Berberis aquifolium var. dictyota], barberry
Relation to host: Working from the upper leaf surface the mites cause irregular longitudinal sinuate folds, anywhere from the edge to the midrib. The mites develop in the fold. 

The mites produce a mass of buds and deformed leaves on the stems. 

In a baggy erineum deformation on the leaves.

The Eriophyid Mites of California