Sounds like lacking of Nitragen, may be too much sun as well?

On Sun, 30 May 2004, Raleighgirl wrote:

The leaves on several of my butterfly bushes are yellow spotted
and shriveling. Is this a disease or an insect problem? One big
old bush is almost ready to croak. Should I cut it back to the
ground again?
Thanks for any and all advice.
Jenny