Wow...thanks for all the suggestions!! I found the fabric available at an online quilt store so I'm thinking maybe I should just replace that section of the quilt back. That might be easiest. It would only require a yard.
As to the mold on my cutting table. I have the supplies to recover it (been meaning to do that for years!) so I think I will take your suggestions and strip off the fabric and padding and treat the wood underneath and take outside into the sun (if we ever get any!).
I suspect the batting has mold on it too so I'm thinking maybe it should be replaced too. Have you ever washed batting alone? Does it stay together? I could use bleach on it because it won't matter if it bleaches it out.
Thanks!