Posted: 04/02/2015 at 14:01
I keep the numbers of greenfly down in my garden by encouraging ladybirds, hoverflies and bluetits into our garden. They will all feed on the greenfly aphids.
It sometimes takes a little while to create the balance of wildlife that will keep the greenfly numbers down, so if my roses get aphids on the growing tips, especially early in the season, I brush them off with my fingers or a soft brush.
I've also found that an occasional weak solution of Ecover washing up liquid in water sprayed onto the aphids will get rid of most of them and it doesn't harm the beneficial insects.
I hope that's helpful