Posted: 29/01/2015 at 20:11
I have been using SB Invigirator spray with good results. It's based on plant oils, so is completely safe for pollinators, pets and children.
It also acts as a foliar feed.
you do need to use it after every rainfall though. It's brilliant stuff and makes the aphids (and other pests) sticky, as well as interfering with their reproductive cycle, apparently.
however, though it will undoubtedly help your plants, I would ask the council if they can take some responsibility for their tree and treat that too.
tip for buying SB - best to buy it undiluted and make it up yourself. Much cheaper and a little goes a long way.