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poplar petiole gall aphid??

poplar petiole gall aphid??
Lac Baker, Madawaska County, New Brunswick, Canada
July 14, 2008
Size: 0.5 mm to 1 cm
Possible poplar petiole gall aphid? Lac Baker is situated in the New Brunswick "panhandle", a strip about 20-30 km wide between Quebec and Maine.


Moved from ID Request.

Some kind of aphid gall...
I stumbled on this article in the library last winter while researching something else, and never got around to mining it for information. I paged through it enough to see that it includes several galls that are not noted in Felt (1), so maybe this one will be in there. Do you know what species of Populus this was?

Moving to Eriosomatinae for now... I'll check out that paper again at some point.

P. tremuloides, probably
This was probably P. tremuloides, Trembling Aspen, which is very common here.

Balsam Poplar?
Another choice to consider would be balsam poplar (Populus balsamifera), whose leaves are more elongate than P. tremuloides (see these photos from CalPhotos), which also occurs in New Brunswick.

I think you are correct. The
I think you are correct. The leaves don't quite have the tremuloides look.

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