Infestation of aphids to the roots of Parsley and Dill

The Dill and Parsley have been afflicted with an infestation of grey coloured Aphids that are nursed by Ants… what can be done to stop this without chemicals?

 

I just let dill and parsley grow throughout the garden as volunteers, thinning them out where they become too abundant. The ones with aphids normally look sickly and are removed. This usually results in enough healthy plants that I never have to worry about controlling their pests. With plants growing in diverse environments, there should always be some that have not been infested.

 

I had a similar problem with aphids and ants. I tried spraying them off. They are fairly sticky and the strong spray caused some damage to the plant. If you brush or spray off the aphids, you can really knock them back and in turn it depletes the ant's food source.