Gwent,
United Kingdom 
advice on treating black fly on braodbeens
8 Jul, 2010
Answers
Have tried this myself, and, it worked for me. Have quite a good crop this year, considering the size of my veggie plot.
8 Jul, 2010
Either spray with an insecticide for aphids or do as we do and make up a spray of soapy water but you need to be using environmentally friendly washing up liquid such as Ecover to do this.
8 Jul, 2010