I am seeing this kind of damage everywhere in the MSU gardens, always south facing for the most part. The harsh winter was very tough on evergreens. I even lost a whole south facing hill of english ivy. My approach will be to let it grow out as much as possible. Eventually the yellow leaves will fall off or a gentle wipe of the hand breaks them off. I am raking out the ivy to remove the dead. Hopefully new growth will emerge soon. Boxwood are always susceptible, and often need some winter protection from south sun or north winds.
