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Red Goldenrod Aphid - Uroleucon nigrotuberculatum

Red Goldenrod Aphid - Uroleucon nigrotuberculatum
Douglasville, Paulding County, Georgia, USA
May 14, 2007
Size: Adults approx. 2-3mm
I apologize for picture quality, but I wanted to post these since this is a new species for the Guide.

Images of this individual: tag all
Red Goldenrod Aphid - Uroleucon nigrotuberculatum Red Goldenrod Aphid - Uroleucon nigrotuberculatum


Plant host... a goldenrod (Solidago), probably a member of the confusing Canada Goldenrod-Tall Goldenrod (S. canadensis-S. altissima) complex; of the two, the very hairy stem and leaves plus the entire to slightly toothed leaf margins would indicate Tall Goldenrod (S. altissima: image from AlabamaPlants).

Additional view of this plant:

Thank you for reviewing these photos. I don't know why I didn't catch that. I even remember the yellow blooms. I really appreciate the host plant ID.

And of course, that means I have these aphids placed in the wrong species, and they should be Uroleucon nigrotuberculatum instead.

Again, many thanks for the help. :)

What is this ID based on?
There are many Uroleucon spp. on goldenrods... On S. altissima/canadensis, U. caligatum and U. pieloui are also possible, though I don't know if they're found in your area.

Yes, those are both in the area to my knowledge. However, caligatum is green, and to my understanding, pieloui is more brown than red. I also thought pieloui used Solidago bicolor as a host plant, but I'm far from certain.

I was under the impression that nigrotuberculatum was the only red Uroleucon that fed on S. altissima/canadensis, but aphids are far from my specialty and I'm not up on the most recent data.

I know aphid taxonomists prefer to avoid photo ID determinations in most cases, but I thought it was safe in this instance given the few monophagous Uroleucon species that feed on this particular host plant. But if the consensus is that it would be better to move these photos up a level, I have no problem with that.

Sounds good
I should have checked the descriptions before commenting. This ID is probably at least as sound as any of the other Uroleucon IDs here. For the record, though, according to Moran (1984; see genus guide page), the host plants for U. pieloui include Solidago rugosa, S. canadensis, S. altissima, S. patula, and S. gigantea. "It feeds on a range of Solidago species but appears to be somewhat specialized to the more pubescent ones, S. rugosa and S. patula."