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Photo#1316592
aphids - Aphis nerii

aphids - Aphis nerii
Cross Plains, Dane County, Wisconsin, USA
August 1, 2016
The morning glory vines were host to quite a few of these aphids over the summer. I thought it was odd to have both the yellow-colored and dark-colored together.

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aphids - Aphis nerii aphids - Aphis fabae aphids - Aphis nerii

Moved
Moved from Aphids.

Look like Aphis nerii and Aphis fabae.
If you mean morning glory as in Convolvulus, both aphids have been recorded on that genus before.

http://www.aphidsonworldsplants.info/C_HOSTS_Coe_Cou.htm#Convolvulus

As James said, you sometimes find two different species on the same plant.

https://influentialpoints.com/Gallery/Aphis_nerii_oleander_aphid.htm

https://influentialpoints.com/Gallery/Aphis_fabae_Black_Bean_aphid.htm

two species
The yellow aphids look like Aphis nerii. The black ones do not. One does occasionally see more than one species of aphid on a single plant. More unusual is to see Aphis nerii on a plant not in Apocynaceae (incl. milkweeds), but it happens.
And the ant is Formica montana.

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