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Photo#88282
Red Aphids - Uroleucon

Red Aphids - Uroleucon
Herring Run Watershed, Baltimore City County, Maryland, USA
September 12, 2006
On a Bidens sp., I believe.

Perhaps, "Goldenglow Aphid (Dactynotus rudbeckiae): Adults are bright red, around 1/6 inch long, and have long legs." [http://www.uga.edu/vegetable/aphids.html]

Bidens
I agree with the ID of the host plant as a species of beggarticks (Bidens}; with simple, toothed, petiolate leaves, possibly Purplestem Beggarticks (B. connata).

Moved

ID
There are many red Uroleucon species, and species ID in this case is not possible.

Moved
Moved from Uroleucon.

Moved
Moved from Brown Ambrosia Aphid.
You are right, with so many species in this genus it is better to be cautious.

Moved
Moved from Aphids.

 
I wonder if these would be better at genus level?
According to our info page, the Brown Ambrosia aphid specializes on Giant Ragweed - so could this be one of the other spp., since it's on a different member of the Asteraceae?

They look similar to
The ones IDed as Brown Ambrosia Aphids which were also called Dactynotus rudbeckiae.

I've also seen these red aphids on composites
and I like your guess on ID, though I would caution just because the description fits, it doesn't mean there aren't other similar ones. We don't have much aphid expertise here yet. There are 1351 spp. of aphids in the US and Canada - I don't know how many of those are red and happen to host on Asteraceae - do you? : )

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