Lyn, that reminds me of how The Fairy behaved a couple of years in a row. The new growth was pale and yellow, but the other roses in the same bed showed no signs of distress. A little soluble nitrogen took care of the problem both years. This year the new growth looks great. My theory is the wood chips I mulched with hadn't aged long enough beforehand, but I used them all over the garden and only The Fairy showed symptoms.
