Just a guess, but it might be mites. My Black Knight looks horrendous, yet my white & Pink Delight look spectacular. I also had mite problems with Sungold, which I replaced with Black Knight. Harsh spraying with the hose, especially underneath the leaves, will rid the bush of the mites. Do this every day for about a week. I think that's what I had done with my Sungold and did earlier this summer on the Black Knight. I've never had any major problems with insects on the majority of my buddleias, just a few JB's, and don't use pesticides.

Thank you for the reply Tracy, I took a sample of the bush down to our local agway store. They thought that it was a blight of some kind rather than mites. They suggested that i contact the Warren cty. agricultural extension and see if the had any ideas. I'll keep the forum posted.