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Aphidiidae 06a - Eriosoma

Aphidiidae 06a - Eriosoma
Republic, Ferry County, Washington, USA
June 23, 2008
Mass of aphids in a distinctive mass of leaves

Images of this individual: tag all
Aphidiidae 06a - Eriosoma Aphididae 06b - Eriosoma


Moved from Aphids. I think there are several erisomatines (woolly aphids) that occur on elm. They may all be Eriosoma spp., but I'm not sure.

...appears to elm (Ulmus). The only elm species listed in the PLANTS database as naturalized in Washington (there are no native species there) is Ulmus pumila" class="bb_url">Ulmus pumila, but these leaves look too large to be that. Given its location in a domestic yard, it could be a planted specimen of Red Elm (U. rubra) or American Elm (U. americana).

Thanks John
I forgot to note the host plant was an elm, sorry! I can confirm that it isnt an U.americana as the only three in the county (that i know of) are in the side yard of the int. center. There are a number of this particular species in the area, most in yards but a number are "wild", and they do appear to match U. rubra more closely then U. pumila.

Hitchcock and Cronquist (1973)... the Flora of the Pacific Northwest: an Illustrated Manual (known for its brevity in abridging a related multi-volume set) succinctly state the status of Ulmus there as "various cultivated species, sometimes persistent around abandoned homes and mistakable for native." We could also add occupied homes and an international center. ;)

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