Aceria elongata

Erineum roseum
Eriophyes regulus
Eriophyes elongatus

Hosts: Acer saccharum

Red erineum patches on the upper surfaces of leaves.

Note about Erineum roseum Schultz (Harlow): Hagen (1885) p. 24, # 25, "Acer saccharinum Wang". Pl. [Place] Shelburne, NH, August 1882. Prof. Harlow [collector of fungi]. Erineum roseum Schult. (Farlow); small velvety patches [red] on the upper surface of leaves. [This shows the great confusion in the names of the maples; Silver Maple, Acer saccharinum, never has red erineum on the upper surface of the leaves. The host was actually Acer dasycarpum Ehrh., regarded by , the old name for the sugar maple, Acer saccharum L. I have collected it many times from Sugar Maple.]

"Aceria regula is the deutogyne and a junior synonym; Aceria elongata is the protogyne; Aceria elongata has seniority by pagination in the 1913 paper (#272)" based on comments in #4062. Aceria regula is not the deutogyne; the deutogyne lacks MT on dorsal opisthosomal annuli; Hodgkiss illustrated a mite with complete dorsal microtuberculation and a distinctive shield pattern. Aceria regula is probably an inquiline that occurs in the red erineum in New York.

Range: MI, NY, WV, Canada

Eriophyes elongatus

Hosts: Acer saccharum

Hodgkiss distinguished Eriophyes elongatus and E regulus, which cause the familiar glossy crimson erineum on the leaves of sugar maple. According to Jeppson et al. (1975), the latter species is a synonym of E. elongatus. The colorful erineum on sugar maple is remarkably similar to that produced by Eriophyes calaceris (Keifer) on Rocky Mountain maple (Acer glabrum Torr.). It is one of the most attractive and brilliant growths on the leaf surface.

The pustulelike patches, at first greenish white and later becoming crimson or purplish, are generally scattered on the upper surface of the leaves. Close examination of the erineum patch shows an aggregation of tiny, rounded, capitate papillae that contain red fluid. The density of the erineum is variable. Occasionally the growth becomes extremely abundant and causes leaf distortion and premature leaf drop.

Eriophyes elongatus
[Eriophyes maculatus, regulus, Phyllocoptes constrictus and variabilis are also listed as distinct valid species causing the same symptom. Only elongatus is now understood to be a valid inducer; the others are synonyms, vagrants, or inquilines.]

Acer saccharum

Red erineum on the upper leaf surface

Eriophyes elongatus sp. nov.

Described from individuals found among red erineum galls on the upper surfaces of leaves of the sugar maple, Acer saccharum L.

[Eriophyes maculatus is also described from galls of an identical description; later work treats that species as an inquiline of elongatus]

Eriophyes regulus sp. nov.

Described from individuals found among red erineum galls on the upper surfaces of leaves of the sugar maple, Acer saccharum L.