Posted: 06/10/2013 at 12:46
I think the only sure answer is reluctantly, insecticide. Even the ones that escaped the blow lamp crawl back on, it's unbelieveable how quick they've spread, I thought it was a fungus at first. It's a very well established tree and was kept watered, but I did notice a patch of the honeydew you mentioned prior to trimming a large branch which must have attracted more.
Many thanks for your help.