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Photo#187733
ants and aphids on an apple tree - female

ants and aphids on an apple tree - Female
apple tree in lowell, Kent County, Michigan, USA
June 4, 2008
Size: 2-4mm aphid, ~1cm ant
These ants have started an aphid farm on my apple tree. I'm clueless with both groups, any experts have an ID to offer on both the ants and/or the aphids?

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ants and aphids on an apple tree - female aphids on an apple tree

Moved
Moved from Aphids.

ID
Aphidinae

Formica fusca?
The ant is a Formica but I don't know the species.