Yup, saw the same thing here last week so I sprayed all my fields. Finished up on Friday and it was just in time. You can really see the beans recover after they were sprayed. Next time I have them, I will spray at 100 per plant. Too many aphids will cause the plant to abort flowers and pods. Wait too long and you have no chance of getting any yield out of that pod. Hit them early enough and at least the pod will set and you have a chance of making some beans in there. Plants were all sticky from the honeydew. Went from 100 /plant to 250+ in 2 days. You just can't scout your fields often enough.

Ed, the problem here in Canada ( Ontario anyways ) is that only two products are registered for aphids in soybeans. 1. Matador-- which I think is your Warrior.   Great for small plants ,but tough to get through the canopy when the plants are big and the aphids have moved lower on the stem.   2. Lagon--- a dimethoate. It's systemic,  should work better, but not good enough for me.   You guys have better chems available like Lorsban which kills by inhalation. A quick kill. It's available here in Canada ,but not labeled for soybeans as of yet.

Looks like Quebec is the hardest hit with a lot of aphids in Ontario as well. Southern Ontario has seen them in May on very young plants. Not sure how they are doing now.