Sorry for the resurrected post but this is the first result in Google (2018) so I thought I would help other people looking also.
I can not see any aphids but I am also a very novice gardener so I doubt everything I do.
It seems that these ants are just ripping up my corn plant and drinking from it or possibly eating it also?
Please help. I am going to try DE but from what I have read ants won't/can't eat fibers like that and I am intrigued to hear from someone who knows anything.
If this forum doesn't allow new users to post images in posts here is direct links
https://i.imgur.com/Z9Uvl1S.jpg
https://i.imgur.com/fZIiG40.jpg