Posted: 28/04/2013 at 20:56
Thanks Bob, I shall take more photos tomorrow as the problem is getting worse by the day with the young plant being covered in the white pwdery substance.
My greenhouse is full of young seedlings and plants but its only affecting my Dahlias. I purchased them as tubers just a few weeks ago from a well known online seed supplier. Im wondering if the tubers were already affected before I got them, seeing as no other plant is affected?