That picture is as unclear as can be. I guess it is a mummy, so a wasp got to it. One needs some serious amount of wasps to take care of the amount of aphids that can grow, I had a swarm of tiny black wasps (these are the ones you need) one year on my currant bush and still tons of aphids.
In the spring I just stay on top of them with neem or other oils emulsion. I have few plants, I see a leaf or tip with aphids, bam, so they haven't been a problem.
They usually get much worse in autumn, the plants now have a ton more leaves, and you don't really know when to expect them.
If you want to go the more toxic route, use some modern neonicotinoid which are supposed to not affect bees (supposed, but still better than proven toxic).
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